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Invisibility
Invisibility is a status effect which makes units and heroes not appear on their opponent's screen or minimap, and makes them unable to be targeted directly by the enemy. Invisibility makes the unit's model appear transparent, but clearly visible still for allies. If it is an allied hero, its dot on the minimap also turns into a ring for the duration. A unit can gain (usually temporarily, but not always) invisibility through certain spells, items or the Rune of Invisibility. Some units, like most wards have permanent invisibility and do not need to acquire it through other sources. Generally, a unit keeps the gained invisibility until the duration runs out, or they perform an attack or a spell or item cast. True Sight and shared vision allows a unit to see invisible enemies without dispelling the invisibility. True Sight makes the units appear transparent, while shared vision only shows a silhouette. Both make the unit directly targetable again, without dispelling the invisibility.
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Fade time and fade delay[edit]
Most sources of invisibility require some time to turn the unit fully invisible. During this time, the unit is still visible and targetable.
The fade time is a short delay before the actual invisibility is applied, during which a unit's model appears transparent, but still visible to everyone. During it, the unit does not automatically attack nearby enemies, no matter if the auto attack option is turned on or not. It also stops attacking when an attack order was already ongoing. Unlike during the actual invisibility, during the fade time, the unit can cast spells or items and even attack without canceling the invisibility. During the fade time, the unit is not phased, even when the invisibility of the spell phases the unit.
The fade delay is also a short delay before the actual invisibility is applied, but has some significant differences. First off, during the fade delay, the unit's model does not appear transparent. Furthermore, the unit does not stop automatically attacking nearby enemies when the auto attack option is turned on, and the fade delay does not cause the unit to cancel an already ongoing attack order either. Unlike during the fade time, it is not possible to cast spells or items or attack during the fade delay without resetting it. During the fade delay, the unit is not phased, even when the invisibility of the spell phases the unit.
Unit behavior during invisibility[edit]
While invisible, a unit never automatically attacks any nearby enemy, not even when it is revealed by True Sight and being attacked. However, when issuing an attack ground order, the invisible unit attacks. Generally, the invisibility is lost upon reaching the attack point. For ranged heroes, this is upon projectile launch. Depending on the source, invisibility may or may not apply a phase effect on the unit.
As for spell casts, the invisibility is lost upon reaching the cast point of the spell. This means that spells with extended effects like 
Eclipse or 
Epicenter do not cancel the invisibility upon each beam or pulse. Channeling spells do not cancel it either when going invisible after the channeling started.
All ranged attacks and most projectiles of abilities are disjointed by invisibility. It is enough for a unit to turn fully invisible even just for a split second as a disjointable projectile flies to fully disjoint it. However, some projectile abilities still affect invisible units, and some have other effects entirely. Invisible units are still fully or partially affected by spells which affect an area.
Sources of invisibility[edit]
Fade Time: 1/0.75/0.5/0.25
Duration: 20/25/30/35
Phased: Yes
Affects self.
Radius: 900
Fade Delay: 2
Duration: Permanent
Phased: No
Affects Broodmother and all her spiders while inside the web. The free pathing is independent from the invisibility.
Fade Time: 0.6
Duration: 20/25/30/35
Phased: Yes
Affects self.
Fade Delay: 0.6
Duration: 5
Phased: Yes
Can be cast on self or allied heroes. The target stays invisible for the whole duration. When breaking invisibility, the unit turns invisible again after the fade delay.
Fade Delay: 3
Fade Time: 1
Duration: Permanent
Phased: Yes
Affects self. Available for level 3 and 4 hawks. 3 seconds fade delay, followed by 1 second fade time before invisibility. Remains invisible until moving.
Fade Time: 2
Duration: 45
Phased: No
Affects the hero activating the rune.
Fade Time: 0
Duration: 120
Phased: Yes
Affects self.
Fade Delay: 1.7
Duration: Permanent
Phased: No
Affects self. Available for level 4 wolves only.
Fade Delay: 2.5/2/1.5
Duration: 15
Phased: No
Affects all allied heroes. Affected heroes stay invisible for the whole duration. When breaking invisibility, the unit turns invisible again after the fade delay.
Fade Time: 0
Duration: 40/50/60
Phased: Yes
Affects self.
Fade Time: 0
Duration: Permanent
Phased: Yes
Affects self. Stays invisible until unburrowing or death. Invisibility is not lost upon casting spells or items. Immobile and disarmed while burrowed.
Fade Time: 0
Duration: Permanent
Phased: Yes
Observer Wards are permanently invisible.- Fade Time: 1.75
Duration: Permanent
Phased: Yes - Fade Time: 2
Duration: Permanent
Phased: Yes
Psionic Traps are permanently invisible. - Fade Time: 2
Duration: Permanent
Phased: Yes 
Fade Delay: 6/5/4/3
Duration: Permanent
Phased: No
Affects self. Invisibility is not lost upon casting spells or items.
Fade Time: 0
Max Duration: 50
Phased: No
Affects self. Invisibility lingers for 1.5 seconds after stopping the channeling. Attacking or casting spells instantly reveals Sand King.- Fade Time: 0
Duration: Permanent
Phased: Yes
Sentry Wards are permanently invisible. 
Fade Time: 1.25
Duration: Permanent
Phased: Yes
Can be cast on self or allied heroes. Stays invisible until an attack is executed, a spell or item is cast, or when the hero moves.
Fade Time: 0.3
Duration: 12
Phased: Yes
Affects self.
Fade Time: 0.3
Duration: 14
Phased: Yes
Affects self. Attacking during the fade time breaks the invisibility.
Fade Time: 0
Duration: 4
Phased: No
Affects self. Invisibility is not lost upon casting spells or items or attacking. Immune to True Sight. A smoke cloud is visible at Slark's location.
Radius: 1200
Fade Time: 0
Duration: 35
Phased: No
Affects allied player controlled units in the area. Invisibility is not lost upon casting spells or items. Invisibility is lost when getting within range of enemy heroes and towers. Immune to True Sight.- Fade Time: 2
Duration: Permanent
Phased: Yes 
Fade Time: 0.6
Duration: 20
Phased: Yes
Affects self.
Fade Time: 0
Duration: 180
Phased: Yes
Requires
Aghanim's Scepter. Affects all 
Proximity Mines, 
Stasis Traps and 
Remote Mines within 125 radius of the sign. Also turns the mines immune to True Sight.
Fade Time: 0
Duration: Permanent
Phased: Yes
Affects self. Stays invisible until an attack is executed, a spell or item is cast, or when Templar Assassin moves.
Fade Delay: 6/5/4/3
Duration: Permanent
Phased: Yes
Affects self. Requires a tree within close range to work. Invisibility is not lost upon casting spells or items.
Fade Time: 0
Duration: Permanent
Phased: Yes
Eyes in the Forest are permanently invisible.
Fade Time: 0.25
Duration: 4
Phased: Yes
Affects self. Turns the caster phased immediately on cast, instead of after the fade time.
True Sight[edit]
True Sight allows a unit to see invisible enemies that are in range. Some of the listed spells provide True Sight only during certain situations. Spells which provide shared vision are not listed here, since it is not actual True Sight. A list for that can be found here.
Some abilities provide immunity towards True Sight. This means they prevent True Sight from revealing them.
The following abilities provide True Sight immunity: 
Shadow Dance, 
Smoke of Deceit and 
Minefield Sign (requires Aghanim's Scepter, turns Techies' mines within a 125 radius immune to True Sight).
Sources of True Sight[edit]
Radius: 900
Based on an aura. Its effect lingers for 0.5 seconds.
Max Duration: 5
Reveals the target unit while channeling.
Radius: Global
Visibility Health Threshold: 25%
Provides True Sight over enemies below 25% max health.
Duration: 30
Duration: 1.5/2/2.5/3
Radius: 1050
Duration: 12
Duration: 3
Duration: 1/2/2/3
Radius: 425
Duration: 4/4.5/5- Radius: 1200
Based on an aura. Its effect lingers for 0.5 seconds. 
Radius: 900
Based on an aura. Its effect lingers for 0.5 seconds.
Duration: 4/4.75/5.5 (
6/7/8)
Duration: 2
Duration: 2/3/4/5
Radius: 1000
Duration: 40
Available for level 3 Necronomicon Warriors only. Based on an aura. Its effect lingers for 0.5 seconds.
Min Duration: 0.5
Max Duration: 2.5 (
3.25)
Max Duration: 10
Reveals the target unit while channeling.
Duration: 2
Duration: 25
Duration: 4 or until projectile hits
Hero Duration: 3 ( 4.5)
Non-Hero Duration: 9- Radius: 700
Based on an aura. Its effect lingers for 0.5 seconds. - Duration: 0.4/1/1.6/2.2
Duration: 3/3.75/4.5
Both the regular Overgrowth and the one applied from
Eyes In The Forest provide True Sight.
Duration: 0.9/1.2/1.5/1.8 ( 1.3/1.6/1.9/2.2)
Invisibility interactions with other spells[edit]
All abilities that grant invisibility disjoint projectiles, unless the enemy has True Sight over the unit, in which case the projectile still keeps track of the target until it leaves the radius of True Sight. All physical attack projectiles of each unit and hero, as well as many spell projectiles can be disjointed. Undisjointable spell projectiles fully affect invisible units.
While most abilities affect units even if they are invisible, some only partially affect invisible units, and many do not affect them at all. These include mostly target-seeking abilities and very few area effect abilities. Some other spells also have unique interactions with invisibility. All not listed spells either fully affect invisible units, or cannot target them to begin with.
Does not damage invisible enemy units.
When Axe turns invisible during Berserker's Call, affected enemy units can cast spells and items during it and automatically attack other nearby enemy units, but are frozen in place after receiving a move order for the remaining duration.
When an invisible unit attacks a Nightmared unit, the Nightmare transfers onto it without revealing the unit.
Does not target invisible units.
The ghosts do not attack invisible units. If their current attack target turns invisible, they still chase it until reaching it or hitting their limit, but do not cause damage.
Neither selects invisible units upon cast, nor slashes already selected units when they turn invisible before it is their turn to get slashed.
Does not target invisible units.
Does not target invisible units.
Does not jump on invisible units.
Does not jump on invisible enemies.
Does not jump on invisible units.
Does not jump on invisible units.
Does not jump on invisible units.
Does not jump on invisible units.
Does not jump on invisible units.
Fully ignores invisible enemies.
Does not jump on invisible units. If the current target turns invisible before impact, the jump neither counts, nor increases the damage, and the snake continues jumping to nearby valid targets.- Does not hit invisible units.
First meteor does not target invisible units.
Does not jump on invisible units.
Does not jump on invisible units.
As secondary target, the area effect hits invisible units.
Invisibility does not stop a multicast. Invisible units can be targeted by Ignite multicast, but the projectile is immediately disjointed.- As secondary target, the area effect hits invisible units.
When an enemy turns invisible while within its detection radius, it registers that enemy until it leaves the radius. However, when an invisible enemy enters the radius, it is not detected.
Fully affects invisible units.
Does not strike invisible units.
Does not jump on invisible units.
Does not target invisible units.
Does not target invisible units. As secondary target, the area effect hits invisible units.
Does not target invisible units when the current target dies.
As secondary target, the area effect hits invisible units.
As secondary target, the area effect hits invisible units.
Invisible units cannot trigger this traps, however, when other units trigger it, invisible units within the radius are stunned.
Does not target invisible units.
Cannot toss invisible units within the 275 grab radius.
Triggers on invisible units without revealing them.- Does not root invisible units.
Invisible enemy units are not counted towards the damage/heal.
Does not spawn zombies for invisible units.
Does not bind to invisible units.
Does not jump to invisible units.
Attacks do not jump to invisible units.
Does not jump to invisible units.- Does not damage invisible units.
See also[edit]
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