Vision

Vision changes around while the hero moves.

“

▶️ Oh, nice view! — Monkey King

”

Vision describes what a unit can and cannot see within a circular area from its current location and state. Places a unit cannot see are filled with the Fog of War, a dark mist that hides enemy units inside of it. Allied units cannot be hidden by the fog of war. Invisible units cannot be seen even when outside of the Fog of War, unless they are revealed by a source of True Sight. Trees and higher elevation block a unit's vision if it has ground vision. Flying vision is unobstructed by trees and elevation. Abilities can grant vision over areas as well, usually for a short amount of time and limited to their area of effect.

All vision is shared within a team, which means that everything allied units see can be seen by the player as well. This includes allied player-controlled units, as well as NPC units, like lane creeps and buildings.

Fog of War

All areas outside of friendly vision are constantly covered by the Fog of War. Any non-friendly units within the Fog of War cannot be seen or directly targeted, however they can still be hit by non-targeted spells. To unveil units in the Fog of War, an allied unit must gain vision over that area.

If an enemy enters the fog of war during the cast time of an ability, the cast gets canceled. However, attacks do not cancel if their targets enter the fog of war during the attack animation.

Elevation

Main Article: Map#Terrain

Units cannot see areas that are on higher elevations than them.

The Dota 2 map has a lot of different levels of ground elevation, which not only, but mainly affect the vision of units. Units with ground vision cannot see areas that are on higher elevation than them. For example, a unit standing in the river (which is the on the lowest elevation) cannot see anything past the cliffs surrounding the river, or beyond the ramps leading out of the river.

On the other side, units standing on higher elevation effectively have unobstructed vision on lower elevation. For example, a unit standing on an elevated ward spot can see the entire surrouding, unobstructed by nearby trees, regardless of their vision type.

Units with flying vision do not have their vision obstructed by higher elevations.

Trees

Main Article: Trees

Amount of vision blocked by single tree changes based on proximity to it.

Besides blocking pathing, trees also block vision for units on the same elevation as them, and for units one elevation above them. Trees block vision like how objects cast shadows: The closer the object is to the source of light, the bigger and wider the object's shadow gets. The closer a unit is to a tree, the more vision is blocked by the tree, blocking out an entire section of the circular vision area of the unit. The exact numbers for these are unknown.

The small trees created by Iron Branch, Ironwood Tree, Woodland Striders, and Sprout have a narrower vision blocker than the regular trees on the map.

Units with flying vision do not have their vision obstructed by trees.

Vision blockers

Besides trees and higher elevation, there are also some artificial vision blockers. Roshan's pit entrance is sealed by a vision blocker, preventing units from outside the pit from seeing inside it, and units from inside to see outside of the pit. Both fountains have a vision blocker at their stairs as well, preventing enemies of the respective teams from seeing inside the fountain area. However, this vision blocker is redundant, since the fountains' higher elevation creates the same effect.

Currently, no ability creates artificial vision blockers.

Units with flying vision do not have their vision obstructed by vision blockers.

Time of day

Another factor in vision range is the current time of day. Most units' vision range is lower during nights and higher during the day, although there are exceptions to this, with some units having lower vision during the day and higher at night, and some units having the same vision regardless of daytime.

Base vision ranges

Most units have day and night vision, only very few have absolutely no vision. These values can be altered with vision bonuses and reductions.

Heroes

All heroes have a vision range of 1800 during the day and 800 during the night, except for following

Unit	Day	Night
Bane	1800	1200
Batrider	1600	800
Bounty Hunter	1800	1000
Night Stalker	800	1800
Slark	1800	1800
Sniper	1800	1400

Creeps

All lane and jungle creeps have a vision range of 800 during the day and the night, except for following

Unit	Day	Night
Flagbearer Creep	750	750
Lycan Lane Wolf	1200	800
Mega Flagbearer Creep	750	750
Mega Melee Creep	750	750
Mega Ranged Creep	750	750
Mega Siege Creep	750	750
Melee Creep	750	750
Ranged Creep	750	750
Siege Creep	750	750
Super Flagbearer Creep	750	750
Super Melee Creep	750	750
Super Ranged Creep	750	750
Super Siege Creep	750	750

Summons

All summons creeps have a vision range of 800 during the day and the night, except for following

Unit	Day	Night No results

Wards

Unit	Day	Night
Anchor	0	0
Death Ward	1200	800
Fiend's Gate	500	500
Healing Ward	600	600
Homing Missile	400	400
Ice Spire	800	800
Ignis Fatuus	1800	800
Jex	600	600
Lookout	0	0
Nether Ward	600	600
Nimbus	500	500
Observer Ward	1600	1600
Phoenix Sun	1800	800
Plague Ward	800	800
Power Cog	1600	600
Proximity Mine	64	64
Psionic Trap	400	400
File:Roshan's Banner unit icon.png Roshan's Banner	1500	1500
Sentry Ward	0	0
Serpent Ward	1200	800
Skeleton Archer	800	800
Sticky Bomb	700	700
Tombstone	1200	1200
Tornado	300	300

Buildings

Building	Day	Night	True Sight	Attack
Ancient (Building)	2600	2600	900
Effigy Building	900	600	0
Fountain	1800	1800	1200	1200
Lotus Pool	500	500	0
Melee Barracks	900	600	0
Outpost	500	500	0
Ranged Barracks	900	600	0
Tower (Tier 1)	1900	600	700	700
Tower (Tier 2)	1900	1100	700	700
Tower (Tier 3)	1900	1100	700	700
Tower (Tier 4)	1900	1100	700	700
Twin Gate	500	500	0
Watcher	800	800	0

Types of vision

There are 2 types of vision, ground vision (also known as obstructed vision) and flying vision (also known as unobstructed vision). Ground vision is impaired by higher elevations, trees, and vision blockers, while flying vision is completely unhindered.

Every hero has ground vision. Other units have the following vision types

Units	Vision type
Beetle, Familiar, Hawk, Tornado	Flying
Alpha Wolf, Anchor, Ancient, Ancient Black Dragon, Ancient Black Drake, Ancient Frostbitten Golem, Ancient Granite Golem, Ancient Ice Shaman, Ancient Rock Golem, Ancient Rumblehide, Ancient Thunderhide, Astral Spirit, Boar, Centaur Conqueror, Centaur Courser, Courier, Dark Troll Summoner, Death Ward, Earth, Effigy Building, Eidolon, Fell Spirit, Fiend's Gate, Fire, Flagbearer Creep, Forged Spirit, Fountain, Ghost, Giant Wolf, Harpy Scout, Harpy Stormcrafter, Healing Ward, Hellbear, Hellbear Smasher, Hill Troll, Hill Troll Berserker, Hill Troll Priest, Homing Missile, Ice Spire, Ignis Fatuus, Jex, Kobold, Kobold Foreman, Kobold Soldier, Lookout, Lotus Pool, Lycan Lane Wolf, Lycan Wolf, Mars Soldier, Mega Flagbearer Creep, Mega Melee Creep, Mega Ranged Creep, Mega Siege Creep, Melee Barracks, Melee Creep, Minor Imp, Mud Golem, Necronomicon Archer, Necronomicon Warrior, Nether Ward, Nimbus, Observer Ward, Ogre Bruiser, Ogre Frostmage, Outpost, Phantom, Phoenix Sun, Plague Ward, Power Cog, Proximity Mine, Psionic Trap, Ranged Barracks, Ranged Creep, Roshan, Roshan's Banner, Satyr Banisher, Satyr Mindstealer, Satyr Tormenter, Sentry Ward, Serpent Ward, Shard Golem, Siege Creep, Skeleton Archer, Skeleton Warrior, Spiderite, Spiderling, Spin Web, Spirit Bear, Sticky Bomb, Storm, Super Flagbearer Creep, Super Melee Creep, Super Ranged Creep, Super Siege Creep, Tempest Double, Tombstone, Tormentor, Tower (Tier 1), Tower (Tier 2), Tower (Tier 3), Tower (Tier 4), Treant, Twin Gate, Undying Zombie, Vhoul Assassin, Void, Warlock Golem, Warpine Raider, Watcher, Wildwing, Wildwing Ripper, Wraith King Skeleton	Ground

Modifying vision

Several abilites and items have abilities that grant or reduce vision.

Vision increasing abilities

Vision increasing abilities and items

• Lycan - Shapeshift
  
  Night vision bonus: Global
  Duration: 40% ( )
  Affects the caster, or the Wolf Bite target.
• Luna - Lunar Blessing
  
  Night vision bonus: 250/500/750/1000
  Passive.
• Batrider - Firefly
  
  Vision bonus:
  Duration: ( )
  Affects the caster.
• Winter Wyvern - Arctic Burn
  
  Night vision bonus: 500
  Duration: 5 ( )
  Affects the caster.
• Moon Shard - Consume
  
  Night vision bonus: 200
  Duration: Permanent
  Affects the target ally. Multiple instances do not stack. Takes priority over all other vision change effects. Does not stack with Shade Sight.
• Moon Shard - Shade Sight
  
  Night vision bonus: 400
  Passive. Takes priority over all other vision change effects. Does not stack with Consume.
• Seer Stone
  
  Vision bonus: 350
  Passive item stat.
• Vampire Fangs
  
  Night vision bonus: 300
  Passive item stat.

Vision reducing abilities

Vision reducing abilities

• Bane - Nightmare
  
  Duration: 200
  Affects the target unit. Sets their vision to 100. Takes priority over all other vision changing effects, except for Shade Sight.
• Spectre - Desolate
  
  Vision reduction:
  Duration:
  Affects the attack target. Takes priority over all other vision changing effects, except for Shade Sight and Consume.

Vision setting abilities

These abilities set a unit's vision to a specific value.

Vision setting abilities

• Bane - Nightmare
  
  Duration: 200
  Affects the target unit. Sets their vision to 100. Takes priority over all other vision changing effects, except for Shade Sight.
• Monkey King - Tree Dance
  
  Day vision: ( )
  Night vision: ( )
  Affects the caster. Lasts until unperched. Takes priority over all other vision changing effects, except for Shade Sight and Consume.

Vision granting talents

The following heroes have a talent that grants them bonus vision.

Bonus	Level 10		Level 15		Level 20		Level 25
	Left	Right	Left	Right	Left	Right	Left	Right
Night vision		+500

Sources of vision

Units are not the only entities with vision. A lot of abilities are able to create vision cells of varying sizes on the world, revealing an area of a fixed duration.

Caster vision

Caster vision granted over Bane to his enemies for casting Brain Sap on them.

Caster vision is a vision cell granted to the victims of targeted spells and attacks. Whenever a unit casts a spell (except Charge of Darkness) on an enemy within 1800 range, or performs an attack on them, the enemy gains 150 radius ground vision around the casting or attacking unit which lasts for 2 seconds. This vision prevents players from easily and constantly harassing enemies from the fog of war, especially with long-distant spells that can be spammed easily like Arcane Bolt, or with ranged attacks.

Only one of these vision cell can exist per unit. This means if a vision cell already exists from a previous targeted order, performing another targeted order within the previous vision cell's duration does not create a second vision cell. Instead, the location of the previous vision cell gets updated, its duration gets reset, and its vision type is changed to flying vision.

Caster vision is also applied upon launching an attack. The result of the attack does not, if the attack is executed, the vision is granted.

Ground vision

Ground vision is obstructed by trees, higher elevations, and vision blockers.

Sources of ground vision

• Aegis of the Immortal - Reincarnation
  
  Day vision radius: 1800
  Night vision radius: 800
  Provides ground vision around the hero upon triggering. Lingers for 5 seconds.
• Ancient Black Dragon - Fireball
  
  Vision radius: 300
  Provides ground vision within the target area. Lingers for 8/9/10/12 seconds.
• Arc Warden - Spark Wraith
  
  Vision radius: 300
  Provides ground vision around the wraith while stationary, starting upon cast. Lingers for seconds. Triggering the wraith removes the vision.
• Bane - Fiend's Grip
  
  Vision radius: 400
  Provides ground vision around the target unit. Duration is based on the channel time after reductions and amplifications. Always lingers for the full duration, even when canceled.
• Bloodseeker - Blood Rite
  
  Vision radius: 600
  Provides ground vision within the area. Lingers for 5 seconds.
• Clockwerk - Hookshot
  
  Vision radius: 200
  Provides non-lingering ground vision around the hook's tip as it travels and upon retracting. Provides 400 radius vision at the max distance upon reaching it, if not latching.
• Crystal Maiden - Crystal Nova
  
  Vision radius: 900
  Provides ground vision at the target area. Lingers for 6 seconds.
• Disruptor - Kinetic Field
  
  Vision radius: 350
  Provides ground radius within the target area. Lingers for 5 seconds.
• Elder Titan - Astral Spirit
  
  Vision radius: 400
  Provides non-lingering ground vision around the spirit, until it returns or dies.
• Enigma - Black Hole
  
  Vision radius: 800
  Provides ground vision at the target area. Lingers for 4 seconds.
• Kunkka - Torrent
  
  Vision radius: 400
  Provides ground vision at the target area. Lingers for 3.1 seconds.
• Kunkka - X Marks the Spot
  
  Vision radius: 400
  Provides ground vision around the x mark on the ground. Lingers for 5.94 seconds.
• Luna - Eclipse
  
  Vision radius: 6/9/12
  Provides ground vision within the target area when cast on the ground. Lingers for 2.4/4.2/6 seconds.
• Manta Style - Mirror Image
  
  Vision radius: 1000
  Provides ground vision around the caster upon cast. Lingers for 0.1 seconds.
• Monkey King - Primal Spring
  
  Vision radius: 375
  Provides ground vision within the target area. The duration is based on the channel time, plus the travel time based on the distance. Always lingers for the full duration, even when canceled.
• Phantom Lancer - Doppelganger
  
  Vision radius: 900
  Provides ground vision within the illusion gather area. Lingers for 1 second.
• Phoenix - Launch Fire Spirit
  
  Vision radius: 200
  Provides ground vision within the affected area on impact. Lingers for 1 second.
• Riki - Tricks of the Trade
  
  Vision radius: 450
  Provides ground vision within the attack radius. Duration is based on the channel time. Always lingers for the full duration, even when canceled.
• Spectre - Spectral Dagger
  
  Vision radius: 200
  Provides ground vision around the shadow trail left by the dagger, and by hit enemy heroes. Lingers for 12 seconds.
• Techies - Proximity Mines
  
  Vision radius: 400
  Provides ground vision around itself upon exploding. Lingers for 1 second.
• Tidehunter - Gush
  
  Vision radius: 0 ( 200)
  Requires Aghanim's Scepter. Provides ground vision at each hit enemy's location. Lingers for 2 seconds.
• Timbersaw - Timber Chain
  
  Vision radius: 100
  Provides non-lingering ground vision around the hook's tip as it travels.
• Undying - [[Undying#|]]
  64px|text-top|link=Undying#
  Vision radius: 1800
  Provides ground vision around the hero upon triggering. Lingers for 5 seconds.
• Wraith King - Reincarnation
  
  Day vision radius: 1800
  Night vision radius: 800
  Provides ground vision around the hero upon triggering. Lingers for 3 seconds.

Flying vision

Flying vision is not obstructed by trees, higher elevations, and vision blockers.

Sources of flying vision

• Ancient Apparition - Ice Vortex
  
  Vision radius: 200
  Provides flying vision at the target area. Lingers for 16%/19%/22%/25% seconds.
• Ancient Apparition - Ice Blast
  
  Vision radius: 500
  Provides flying vision around both projectiles as they travel. The vision of the tracer does not linger. The vision of the ice ball lingers for 3.5 seconds.
• Ancient Apparition - Release
  
  Vision radius: 750
  Provides flying vision at the marked area upon cast. Lingers for 5.3 seconds.
• Arc Warden - Spark Wraith
  
  Vision radius: 300
  Provides non-lingering flying vision around the wraith as it travels towards the target. Provides the same vision around the target's location upon impact. Lingers for 3.34 seconds.
• Batrider - Sticky Napalm
  
  Vision radius: 500
  Provides flying vision at the targeted area. Lingers for 2 seconds.
• Batrider - Flamebreak
  
  Vision radius: 300
  Provides non-lingering flying vision around the explosive cocktail as it travels.
• Beastmaster - Wild Axes
  
  Vision radius: 350
  Provides non-lingering flying vision around the axes as they travel.
• Chaos Knight - Phantasm
  
  Vision radius: 400
  Provides flying vision around the caster upon cast. Lingers for 0.5 seconds.
• Clockwerk - Rocket Flare
  
  Vision radius: 600
  Provides flying vision around the rocket as it travels. Lingers for 10 seconds.
• Disruptor - Thunder Strike
  
  Vision radius: 450
  Provides flying vision around the target's location upon applying the final strike. Lingers for 3 seconds.
• Disruptor - Glimpse
  
  Vision radius: 400
  Provides non-lingering flying vision around the projectile as it travels. Provides the same vision around the target's location after getting teleported back. Lingers for 3.34 seconds.
• Disruptor - Static Storm
  
  Vision radius: 450
  Provides flying vision at the target area. Lingers for 0 ( ) seconds.
• Drow Ranger - Multishot
  
  Vision radius: 100
  Provides non-lingering flying vision around the arrows as they travel.
• Elder Titan - Earth Splitter
  
  Vision radius: 500
  Spawns 12 vision cells along the crack in 0.22-second intervals, with a distance of 200 in between each, which provide vision around where they are spawned. Lingers for 4 seconds.
• Faceless Void - Chronosphere
  
  Vision radius: 475
  Provides flying vision at the target area. Lasts 3.75/4.25/4.75 seconds.
• Grimstroke - Stroke of Fate
  
  Vision radius: 160
  Provides non-lingering flying vision around the ink trail as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 2 seconds.
• Gyrocopter - Homing Missile
  
  Vision radius: 400
  Provides non-lingering flying vision around the missile as it travels. Provides the same vision at the target's location on impact. Lingers for 4 seconds.
• Gyrocopter - Call Down
  
  Vision radius: 350
  Provides flying vision at the target area upon cast. Lingers for 4 seconds.
• Invoker - Tornado
  
  Vision radius: 200
  Provides non-lingering flying vision around the tornado as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 1.75 seconds.
• Invoker - Sun Strike
  
  Vision radius: 400
  Provides flying vision at the target area upon cast. Lingers for 5.7 seconds.
• Invoker - Chaos Meteor
  
  Vision radius: 500
  Provides non-lingering flying vision around the meteor as it starts rolling. Provides the same vision at the max distance upon reaching it. Lingers for 3 seconds.
• Io - Spirits
  
  Vision radius: 350
  Provides flying vision around the hit enemy hero upon impact. Lingers for 3 seconds.
• Io - Relocate
  
  Vision radius: 150
  Provides flying vision at the targeted point upon cast. Lingers for 2.7 seconds.
• Jakiro - Ice Path
  
  Vision radius: 150
  Provides flying vision along the entire path. Lingers for 3 seconds.
• Juggernaut - Omnislash
  
  Vision radius: 300
  Provides flying vision around the caster on each slash. Lingers for 1 second.
• Keeper of the Light - Illuminate
  
  Vision radius: 375
  Spawns vision cells in front of the caster in a line in 0.5-second intervals, with a distance of 150 in between each, which provide vision around where they are spawned. Spawns them until the channeling ends. Lingers for 10.34 seconds.
• Kunkka - Ghostship
  
  Vision radius: 400
  Provides non-lingering flying vision around the ships as they travel.
• Lich - Chain Frost
  
  Vision radius: 800
  Provides non-lingering flying vision around the ball of ice as it travels. Stops after the 60th bounce.
• Mars - Spear of Mars
  
  Vision radius: 300
  Provides non-lingering flying vision around the spear as it travels. Provides the same vision upon reaching max distance, or upon impaling an enemy. Lingers for 1 second if not impaled. If impaled, lingers for 1 ( ) seconds.
• Mars - Arena Of Blood
  
  Vision radius: 550
  Provides flying vision within the target area upon cast. Lasts 0.6 seconds.
• Medusa - Mystic Snake
  
  Vision radius: 300
  Provides non-lingering flying vision around the snake as it travels.
• Meepo - Earthbind
  
  Vision radius: 300
  Provides non-lingering flying vision around the net as it travels.
• Mirana - Sacred Arrow
  
  Vision radius: 500
  Provides non-lingering flying vision around the arrow as it travels. Provides the same vision upon reaching max distance, or upon hitting an enemy. Lingers for 3.5 seconds.
• Naga Siren - Mirror Image
  
  Vision radius: 450
  Provides flying vision around the caster upon cast. Lingers for 0.5 seconds.
• Nature's Prophet - Sprout
  
  Vision radius: 500
  Provides flying vision at the target area upon cast. Lingers for 250 seconds.
• Oracle - Fortune's End
  
  Vision radius: 200
  Provides non-lingering flying vision around the orb as it travels. Provides the same vision at the target's location on impact. Lingers for 2 seconds.
• Phantom Assassin - Stifling Dagger
  
  Vision radius: 450
  Provides non-lingering flying vision around the dagger as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
• Puck - Illusory Orb
  
  Vision radius: 450
  Provides flying vision around the orb as it travels. Lingers for 3.34 ( 9.185) seconds.
• Pudge - Meat Hook
  
  Vision radius: 400
  Provides flying vision around the unit the hook latches on upon latching. Lingers for 4 seconds.
• Razor - Plasma Field
  
  Vision radius: 800
  Provides flying vision around the caster for the entire duration. Lingers for 2 seconds.
• Shadow Demon - Shadow Poison
  
  Path vision radius: 350
  Hit/End vision radius: 300
  Provides non-lingering flying vision around the poison cloud as it travels. Provides flying vision around each hit enemy, and at max distance upon reaching it. Lingers for 3.5 seconds.
• Skywrath Mage - Arcane Bolt
  
  Vision radius: 325
  Provides non-lingering flying vision around the bolt as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
• Skywrath Mage - Concussive Shot
  
  Vision radius: 300
  Provides non-lingering flying vision around the shot as it travels. Provides the same vision at the target's location on impact. Lingers for 3.34 seconds.
• Snapfire - Mortimer Kisses
  
  Vision radius: 500
  Provides non-lingering flying vision around the lava blobs as they travel. Provides the same vision at marked location on impact. Lingers for 3.5 seconds.
• Sniper - Shrapnel
  
  Vision radius: 400/425/450/475
  Provides flying vision within the target area after the effect delay. Lingers for 0.5 seconds.
• Storm Spirit - Ball Lightning
  
  Vision radius: 400
  Provides non-lingering flying vision around the ball of lightning as it travels.
• Sven - Storm Hammer
  
  Vision radius: 225
  Provides non-lingering flying vision around the fist as it travels.
• Techies - [[Techies#|]]
  64px|text-top|link=Techies#
  Vision radius: 600
  Provides flying vision around itself upon detonating. Lingers for 1 second.
• Techies - [[Techies#|]]
  64px|text-top|link=Techies#
  Vision radius: 500
  Provides flying vision around itself upon exploding. Lingers for 3 seconds.
• Timbersaw - Chakram
  
  Vision radius: 200
  Provides flying vision around the sawblade after reaching the targeted location, until it starts to return.
• Timbersaw - Second Chakram
  
  Vision radius: 200
  Provides flying vision around the sawblade after reaching the targeted location, until it starts to return.
• Tiny - Tree Throw
  
  Vision radius: 100
  Provides non-lingering flying vision around the tree as it travels, if ground-targeted. No provided if unit-targeted. Provides the same vision at the target's location on impact, regardless of how it was targeted. Lingers for 2 seconds.
• Tiny - Tree Volley
  
  Tree vision radius: 400
  Impact vision radius: 100
  Provides non-lingering flying vision around the trees as they travel. Provides flying vision at each hit enemy's location on impact. Lingers for 2 seconds.
• Tusk - Ice Shards
  
  Projectile vision radius: 200
  Shards vision radius: 100
  Provides non-lingering flying vision around the projectile as it travels. Provides flying vision around each shard after their creation. Lingers for 2 seconds.
• Vengeful Spirit - Wave of Terror
  
  Vision radius: 300
  Provides flying vision around the wave as it travels. Lingers for 4 seconds.
• Venomancer - Venomous Gale
  
  Vision radius: 350
  Provides non-lingering flying vision around the gale as it travels.
• Void Spirit - Aether Remnant
  
  Travel vision radius: 150
  Stationary vision radius: 200
  Provides non-lingering flying vision around the remnant as it travels. Spawns 2 vision cells in front of the remnant after the delay, one at max distance, and the other halfway through max distance. Lingers for as long as the remnant exists, so if triggered, the vision stops once the pulling ends.
• Weaver - The Swarm
  
  Vision radius: 100
  Provides non-lingering flying vision around each individual beetle within the swarm as they travel.
• Windranger - Powershot
  
  Vision radius: 400
  Provides non-lingering flying vision around the arrow as it travels. Provides the same vision at the max distance upon reaching it. Lingers for 3.34 seconds.
• Zeus - Lightning Bolt
  
  Vision radius: 750
  Provides flying vision around the target point or targeted enemy. Lingers for 4.5 seconds.
• Zeus - Thundergod's Wrath
  
  Vision radius: 500
  Provides flying vision around each hit enemy hero. Lingers for 3 seconds.
• Sentry Ward - Plant
  
  Vision radius: 150
  Provides flying vision around the ward upon cast. Lingers for 12 seconds.
• Town Portal Scroll - Teleport
  
  Vision radius: 200
  Provides flying vision at the teleport destination upon channel begin. Duration is based on the channel time. Always lingers for the full duration, even when canceled.
• Boots of Travel - [[Boots of Travel#|]]
  
  Vision radius: 200
  Provides flying vision at the teleport destination upon channel begin. Duration is based on the channel time. Always lingers for the full duration, even when canceled.
• Gem of True Sight
  
  Vision radius: 300
  Provides non-lingering flying vision around the gem whenever it is on the ground, for the team that dropped it the last.
• Meteor Hammer - Meteor Hammer
  
  Vision radius: 400
  Provides flying vision within the target area upon cast. Lingers for 132.5 seconds.
• Shiva's Guard - Arctic Blast
  
  Vision radius: 800
  Provides flying vision around the caster for the entire duration. Lingers for 2 seconds.
• Mango Tree - Plant a Mango Tree
  
  Vision radius: 1000
  Provides flying vision around the tree, lasting until destroyed. The tree has no set duration. Lingers for 2.5 seconds once destroyed.This is an old ability.

Shared vision

Some abilities are capable of sharing an enemy unit's vision the player's team. This means anything that unit sees can also be seen by its opponents.

Sources of shared vision

• Grimstroke - Phantom's Embrace
  
  Duration: 5
  Shares the target's vision upon latching on it.
• Grimstroke - Soulbind
  
  Duration: 700
  Shares the target's vision, as well as the vision of the secondary target it binds to.
• Meepo - Earthbind
  
  Duration: 2
  Shares all rooted enemies' vision.
• Razor - Static Link
  
  Duration: 10
  Shares the target's vision while draining them.
• Silencer - Last Word
  
  Duration: 3/4/5/6
  Shares the targets' vision during the initial debuff's duration.
• Sniper - Assassinate
  
  Duration: 0.033
  Shares the target's vision upon cast begin. Vision is removed prematurely on projectile impact.
• Spectre - Spectral Dagger
  
  Duration: 7
  Shares all hit enemy heroes' vision as long as they create a shadow path still.
• Spirit Breaker - Charge of Darkness
  
  Shares the target's vision until the charge stops, either upon reaching it, or when canceled earlier.

Exposing

Several abilities are capable of exposing an enemy's model through the fog of war, without truly providing vision over them. This means their surroundings are still shrouded by the fog, but they are visible and targetable as if they were not within the fog of war. Exposed enemies are treated as visible units by every spell.

Exposing an enemy does not cancel out the effects of invisibility, although it does make their silhouette visible. An exposed invisible enemy has its location revealed, and can even be selected like a visible enemy, but is still almost fully treated as an invisible unit. This means it still cannot be targeted by attacks or single-target spells (attempting to do so does nothing at all), and still counts as invisible in terms of spells affecting them, with a very few exceptions. Most sources of exposure also provide True Sight to fully reveal the enemy, but not all do.

Exposing is a default component of shared vision, so that all spell listed in the previous section expose enemies as well. Besides them, the following abilities expose enemies.

Sources of exposure

• Bloodseeker - Thirst
  
  Health threshold: 80%
  Exposes every enemy hero once their health drops below the given percentage. Provides True Sight.
• Bounty Hunter - Track
  
  Duration: 0.5
  Exposes the target enemy. Provides True Sight.
• Dark Willow - Terrorize
  
  Duration: 3.5/3.75/4 ( )
  Exposes all hit enemies. Does not provide True Sight.
• Disruptor - Thunder Strike
  
  Duration: 6 ( )
  Exposes the target enemy. Does not provide True Sight.
• Pugna - Life Drain
  
  Duration: 10
  Exposes the target enemy. Does not provide True Sight.
• Slardar - Corrosive Haze
  
  Duration: 10/15/20
  Exposes the target enemy. Provides True Sight.
• Spirit Breaker - Nether Strike
  
  Duration: 1
  Exposes the target enemy during the cast time. Does not provide True Sight.
• Troll Warlord - Battle Trance
  
  Exposes the current target of the tranced hero. Does not provide True Sight.
• Tusk - Snowball
  
  Exposes the target until the Snowball crumbles. Does not provide True Sight.
• Weaver - The Swarm
  
  Duration: 16
  Exposes the latch targets. Does not provide True Sight.

Vision interaction with spells

Generally, unit-targeted spells require vision over the target, while ground targeted or non-target spells may be cast regardless of vision. Once cast, a spell usually works regardless of vision. Area effects usually do not require vision to affect enemies. Some non-targeted spells that do the targeting themselves may require vision over enemies. There are exceptions to all of these.

The following spells require vision over enemies to affect them

• Abaddon – Aphotic Shield area damage
• Bristleback – Area Viscous Nasal Goo ¹
• Lua error: Found no Cargo data for "Clinkz - Searing Arrows".
• Dark Willow – Bedlam attacks
• Dazzle – Poison Touch secondary projectiles
• Drow Ranger – Marksmanship splinters ¹
• Ember Spirit – Searing Chains
• Gyrocopter – Rocket Barrage
• Gyrocopter – Homing Missile ³
• Gyrocopter – Flak Cannon
• Lua error: Found no Cargo data for "Gyrocopter - Side Gunner".
• Harpy Stormcrafter – Chain Lightning
• Juggernaut – Omnislash
• Leshrac – Lightning Storm
• Leshrac – Pulse Nova's Lightning Storms ¹
• Lich – Frost Shield area damage
• Lion – Mana Drain ^{1 4}
• Luna – Moon Glaives
• Luna – Eclipse
• Maelstrom – Chain Lightning
• Medusa – Split Shot
• Mirana – Starstorm ⁵
• Mjollnir – Chain Lightning
• Morphling – Adaptive Strike ²
• Nature's Prophet – Wrath of Nature
• Night Stalker – Void ¹
• Ogre Magi – Ignite
• Ogre Magi – Multicast ⁶
• Phantom Assassin – Stifling Dagger ²
• Puck – Phase Shift ²
• Razor – Eye of the Storm
• Rubick – Fade Bolt
• Shadow Shaman – Ether Shock
• Shadow Shaman – Mass Serpent Ward ¹
• Skywrath Mage – Arcane Bolt ¹
• Skywrath Mage – Concussive Shot
• Skywrath Mage – Ancient Seal ¹
• Skywrath Mage – Mystic Flare ¹
• Spirit Breaker – Charge of Darkness ³
• Storm Spirit – Electric Vortex ¹
• Tinker – Laser ¹
• Tinker – Heat-Seeking Missile
• Undying – Soul Rip
• Undying – Tombstone
• Visage – Soul Assumption ²
• Witch Doctor – Death Ward ¹
• Zeus – Arc Lightning

¹Requires Aghanim's Scepter.

²Requires a talent.

³When the current target of these spells die, they choose new targets. Only choose visible enemies.

⁴ Mana Drain ends immediately if the target enters the fog of war.

⁵When Starstorm's initial wave requires vision over enemies, the secondary single projectile does not.

⁶When Multicast items and Ignite only target visible secondary targets.

Version history

Version

Description

6.83

• Vision and Fog of War can now be any numerical value, rather than specific intervals (previously it was 0, 64, 192, 320, 448, 576, 704, 800, 832, 960, 1088, 1216, 1344, 1472, 1600, 1728).
  • Previously if you had a vision between the fixed intervals, it would clamp to a fixed value.

6.74

• Removed Unexplored Fog of War.

Patch history

Patch

Description

06 Sep 2016

• Improved FoW testing for attack and spell projectiles.

Mechanics Main Heroes Unit Type (Heroes / Clones / Illusions) Complexity Attributes Table Buyback Level Roles Gold Experience Animations Stats Armor Attributes ( Strength / Agility / Intelligence) / Universal) Health & Mana (HP Regen & MP Regen) Magic Resistance Movement Speed / Slow Resistance Status Resistance Turn Rate Misc Creep Controling Death / Denying Vision Unit Size (Collision Size / Bound Radius / Selection Box / Model Size) Gib Type / Shades Adjectives Buildings Towers / Barracks / Ancient / Fountain Effigy Neutral Buildings (Outposts / Watchers / Twin Gates / Lotus Pools) Abilities Type Active / Passive / Autocast Aura Accuracy / Evasion Channeling Damage Barrier Damage Block Damage Manipulation Damage Over Time Talents Teleport Targeting Area No Target Point Unit Vector Combinations Casting Cast Range / Motion Buffer Cast Animation (Cast Point + Backswing) Cooldown Reduction (Flat / Current Flat / Percentage) Reset Charge-based Runes Bounty Rune Water Rune Wisdom Rune Power Runes ( Amplify Damage Rune / Arcane Rune / Haste Rune / Illusion Rune / Invisibility Rune / Regeneration Rune / Shield Rune) Misc Random Distribution Transformation Attack Damage Attack Damage Instant Attack Heroes Attack Classes Attack Range (Acquisition Range) Attack Speed (BAT / Interval) Damage Types (Physical / Magical / Pure / Instant Kill) Flags (HP Removal / No-reflection / No-Spell-Lifesteal / No-Spell-Amplification) Projectile Speed Spell Damage (Outgoing / Incoming) Modifiers Bash Cleave / Splash Corruption Critical Strike Lifesteal / Spell Lifesteal Mana Break On-hit Effects Misc Damage Instance Animation / Orb Walking Status Effects Disables Cyclone Disabling Orders Forced Movement (Knockback) / Upward Movement Fear (Hypnosis) Hide Hex Root Leash Stun Sleep Taunt Movement Move Speed Slow Flying Movement Phased / Tree Walk / Unobstructed Movement Other Attack Immune / Non-targetable Attack Speed Slow Debuff Immunity Spell Immunity Invulnerability Invisibility Blind Break Disarm Ethereal Silence Mute Trap Dispels Basic Strong Death Items Mechanics Courier Sharing / Selling Disassemble Recipes Neutral Item Drop