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Vision changes around while the hero moves.

Vision describes what a unit can and cannot see from its current location and state. Places a unit cannot see are filled with the Fog of War, a dark mist that hides units inside of it. Invisible units cannot be seen even when outside of the Fog of War, unless they are spotted by a source of True Sight. Units cannot see through trees or to higher elevations - the only exceptions to this rule are flying units, who have unrestricted vision, and Night Stalker/Keeper of the Light with an Aghanim's Scepter at night/day.

All units on your team share vision, which means that if a unit can see through the Fog of War, all allies can as well. This also applies to lane creeps, other controlled creeps, and buildings.

Fog of War[edit]

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 targeted (it is effectively invisible), however they can still be hit by non-targeted spells. To reveal units in the Fog of War, an allied unit must gain vision in that area. Observer Wards provide vision in an area to their team.

If an enemy unit in the Fog of War attacks or targets a spell on a friendly unit, a 100 radius small area around them is revealed for 2 seconds.

Unit Target abilities are cancelled if vision of the target is lost, even if the cast animation already began.


Main Article: Map#Terrain
Units cannot see areas that are on higher elevations than them.

Units cannot see areas that are on higher elevations than them, while units on higher ground receive unrestricted vision below. Additionally, any ranged units attacking an enemy on higher elevation have a 25% chance to miss their target.


Main Article: Trees

Trees also block vision, and can be used to escape enemies by running through small gaps in them (known as "juking"). When trees are cut down or destroyed, they no longer block vision.

Day and night vision ranges[edit]

Most units have different vision ranges for the day and night cycles. Generally, units see a lot farther during the day than they do at night.


Most heroes have 1800 units of vision during the day, and 800 at night, though there are several exceptions. This makes ganking a lot more viable at night, because heroes can get much closer without being detected. Heroes can increase their night vision by equipping Moon Shard icon.png Moon Shard which passively grants 300 bonus night vision, or consume it to gain 150 night vision permanently.

Below is a table of all heroes which do not have the standard 1800/800:

Unit Day Night
Batrider Batrider 1200 800
Bounty Hunter Bounty Hunter 1800 1000
Night Stalker Night Stalker 800 1800
Slark Slark 1800 1800
Sniper Sniper 1800 1100

Heroes that have abilities that increase their vision:

Hero Day Night
Luna Luna 1800 800/1050/1300/1550/18001
Lycan Lycan 1800 800/18002
Winter Wyvern Winter Wyvern 1800 800/12003

1 Luna's night vision increases to 1050/1300/1550/1800 upon learning different levels of Lunar Blessing icon.png Lunar Blessing.

2 Lycan's night vision increases to 1800 during Shapeshift icon.png Shapeshift.

3 Winter Wyvern's night vision increases to 1200 during Arctic Burn icon.png Arctic Burn.

Heroes that have talents that increase their night vision:

Hero Level Talent Upgraded night vision
Slardar Slardar 20 +1000 1800
Spirit Breaker Spirit Breaker 10 +400 1200
Winter Wyvern Winter Wyvern 15 +500 1300/17004

4 Winter Wyvern's night vision increases to 1700 during Arctic Burn icon.png Arctic Burn with the talent.


Allied buildings share vision through the Fog of War with their entire team. Below is a table listing the vision ranges of all buildings:

Building Day Night True Sight Attack
Ancient (Building) 2600 2600 900
Effigy Building 900 600
Fountain 1800 1800 1200 1200
Melee Barracks 900 600
Ranged Barracks 900 600
Shrine 0 0
Tier 1 Tower 1900 800 700 700
Tier 2 Tower 1900 800 700 700
Tier 3 Tower 1900 800 700 700
Tier 4 Tower 1900 800 700 700

Neutrals and Summons[edit]

Most neutrals and summons have 800 vision during day and night.

Below is a list of neutrals and summons that don't have the standard 800/800 vision.

Unit Day Night
Ancient Rumblehide icon.png Ancient Rumblehide 1400 800
Ancient Thunderhide icon.png Ancient Thunderhide 1400 800
Unknown Unit icon.png Astral Spirit 400 400
Unknown Unit icon.png Beetle 321 321
Beastmaster Boar icon.png Boar 1400 800
Brewmaster Earth icon.png Earth 1800 800
Enigma Eidolon icon.png Eidolon 1200 800
Visage Familiar icon.png Familiar 390 390
Brewmaster Fire icon.png Fire 1800 800
Invoker Forged Spirit icon.png Forged Spirit 1200 800
Nature's Prophet Treant icon.png Greater Treant 500 500
Harpy Scout icon.png Harpy Scout 1800 1800
Harpy Stormcrafter icon.png Harpy Stormcrafter 1800 1800
Unknown Unit icon.png Hawk 1000 1000
Hill Troll Priest icon.png Hill Troll Priest 1400 800
Kobold icon.png Kobold 1400 800
Lycan Wolf icon.png Lycan Wolf 1200 800
Necronomicon Archer icon.png Necronomicon Archer 1300/1400/1500 800
Necronomicon Warrior icon.png Necronomicon Warrior 1300/1400/1500 800
Roshan icon.png Roshan 1400 1400
Dark Troll Summoner Skeleton Warrior icon.png Skeleton Warrior 800 600
Broodmother Spiderling icon.png Spiderite 700 700
Broodmother Spiderling icon.png Spiderling 700 700
Lone Druid Spirit Bear icon.png Spirit Bear 1400 800
Brewmaster Storm icon.png Storm 1800 800
Nature's Prophet Treant icon.png Treant 500 500
Undying Zombie icon.png Undying Zombie 1400 1400
Vhoul Assassin icon.png Vhoul Assassin 400 400
Warlock Golem icon.png Warlock's Golem 1800 1800
Unknown Unit icon.png Wraith King Skeleton 800 600

Types of vision[edit]

Flying vision[edit]

Flying vision gives unrestricted vision in an area, so it is not blocked by trees or obstacles and can see all elevations.

Sources of flying vision

Note: Night Stalker and Keeper of the Light may have unobstructed vision during night and day correspondingly if they purchase Aghanim's Scepter icon.png Aghanim's Scepter.

Ground vision[edit]

Also known as normal unit vision, standard vision, and hero vision. This type of vision is blocked by trees, other obstacles, and elevation. All heroes have ground vision by default.

Sources of ground vision

Shared vision[edit]

Some spells share the vision of an enemy unit with your team. Most of these spells allow you to see what the enemy unit sees and some only provide vision over the enemy hero model.

Sources of shared vision
  • Thirst icon.png
    Visibility Health Threshold: 25%
    Reveals enemy model and minimap icon through the Fog of War.
  • Track icon.png
    Duration: 30
    Reveals enemy model and minimap icon through the Fog of War.
  • Terrorize icon.png
    Duration: 5 (Talent 6)
    Reveals enemy model and minimap icon through the Fog of War.
  • Thunder Strike icon.png
    Duration: 6
    Reveals enemy model and minimap icon through the Fog of War.
  • Infest icon.png
    Duration: Until Lifestealer uses Consume or unit/hero dies
  • Life Drain icon.png
    Max Duration: 10
    Reveals enemy model and minimap icon through the Fog of War
  • Static Link icon.png
    Duration: 8 or until the link is broken
  • Last Word icon.png
    Duration: For the duration while the initial debuff is on the target (up to 4 seconds)
  • Corrosive Haze icon.png
    Duration: 18
    Reveals enemy model and minimap icon through the Fog of War
  • Assassinate icon.png
    Duration: 4
    Vision lasts for 4 seconds, until the projectile hits, or until the cast gets canceled, whichever is shorter.
  • Spectral Dagger icon.png
    Duration: 12
    Vision is shared with every enemy hero it collides with. Provides 200 flying vision along shadow paths left behind by struck units.
  • Charge of Darkness icon.png
    Provides shared vision over the target (only the unit model) until the charge ends on it anyway.
  • Snowball icon.png
    Provides position of target and minimap icon through the Fog of War

Version history[edit]

  • 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.
  • The following heroes now have the standard 800 night vision: Drow Ranger, Mirana, Puck, Leshrac, Enchantress, Ancient Apparition, Meepo and Treant Protector.
  • Removed Unexplored Fog of War.

Patch history[edit]

  • Improved FoW testing for attack and spell projectiles.

See also[edit]