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Vision changes around while the hero moves

Vision describes what a unit can and can't 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 can't be seen even when outside of the Fog of War, unless they are spotted by a unit with True Sight. Units can't see through trees or to higher elevations - the only exceptions to this rule are flying units, who have unrestricted Vision, and Night Stalker with an Aghanim's Scepter at night.

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.


[edit] Fog of War

All areas outside of friendly Vision become 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 will provide vision in an area to their team.

If a unit in the Fog of War attacks an enemy that does not have vision of them, they will be revealed temporarily.

[edit] Elevation and Trees

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. 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. Targeted abilites also disjoint if in animation phase even if successfuly cast on a enemy that entered fog of war via elevation.

[edit] Day and Night

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.

Below is a table of all exceptions to the 1800/800 rule:

Hero Day Night
Observer Wards 1800 1800*
Batrider 1200 800
Bounty Hunter 1800 1000
Luna 1800 1800**
Lycan 1800 1800***
Night Stalker 1200 1800
Slark 1800 1800
Sniper 1800 1000
* Observer Wards have their night vision reduced by 25% (like everyone else's) during Night Stalker's ultimate.
** Luna is granted 1800 night vision range by leveling her Lunar Blessing ability.
*** Lycan is granted 1800 night vision range when he uses his Shapeshift ability.

[edit] Buildings

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
Towers 1800 800 900 700
Barracks 900 600 NA NA
Ancients 1800 1800 900 NA
Fountains 1300 1300 900 800
Buffer Buildings 800 550 0 NA

[edit] Flying Vision

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

[edit] Sources of Flying Vision

Batrider - Firefly
Firefly icon.png
Gives Batrider flying vision equal to his current vision distance, 1200 during the day or 800 at night.
Batrider - Flamebreak
Flamebreak icon.png
AoE on projectile: 300
Dazzle - Weave
Weave icon.png
Radius of ability: 775
Duration: 9
Gives flying vision of the area where Weave is cast. Radius is always 775 (Radius of Aghanim's Scepter upgrade) even without scepter.
Kunkka - Ghost Ship
Ghost Ship icon.png
AoE on projectile: 400
Medusa - Mystic Snake
Mystic Snake icon.png
AoE on projectile: 300
Meepo - Earthbind
Earthbind icon.png
AoE on projectile: 300
Nature's Prophet - Sprout
Sprout icon.png
Radius from center: 900
Duration: 3/3.75/4.5/5.25
Shadow Demon - Shadow Poison
Shadow Poison icon.png
AoE from Projectile: 190 Radius
Storm Spirit - Static Remnant
Static Remnant icon.png
Radius from remnant: 800
Duration: 12 or until detonated
Sven - Storm Hammer
Storm Hammer icon.png
AoE on projectile: 225
Timbersaw - Chakram
Chakram icon.png
AoE where Chakram stops: 300
Troll Warlord - Whirling Axes (Ranged)
Whirling Axes (Ranged) icon.png
Tusk - Ice Shards
Ice Shards icon.png
AoE on projectile: 300
Windranger - Shackleshot
Shackleshot icon.png
AoE on projectile: 200
Venomancer - Venomous Gale
Venomous Gale icon.png
AoE on projectile: 400
Vengeful Spirit - Wave of Terror
Wave of Terror icon.png
AoE on Projectile: 300 Radius

[edit] See Also