Stealth is the mechanic by which some units become invisible for a determined period of time. Stealth is divided into three categories: Ambush 2 Camouflage (also known as Strategic stealth), Twilight Shroud Invisibility (also known as Tactical stealth) and Noxious Trap Stealthed traps.

Camouflage

Camouflage is a form of stealth that is activated preemptively in order to ambush an enemy or to bypass the enemy's vision.
  • Camouflaged units are temporarily revealed while within 700 units of a champion, are within the vision radius of enemy Control Ward item Control Ward or enemy turret, or if revealed by an effect that grants unit-vision (e.g. some champion abilities, Scryer's Bloom Scryer's Bloom and Hextech Sweeper item Arcane Sweeper).
  • Camouflaged will briefly shimmer whenever they take damage (e.g. if hit by a skill shot). A unit cannot shimmer more frequently than once per second, and shimmering doesn't make a unit targetable nor remove the stealth effect.
  • Oracle Alteration item Oracle Alteration and Sweeping Lens item Sweeping Lens will outline Camouflaged units.
Invisibility Shimmer


Champions
  • EvelynnSquare Evelynn's Demon Shade Demon Shade, starting from level 6, allows her to permanently enter camouflage after being out-of-combat for 4 seconds.
  • RengarSquare Rengar's Thrill of the Hunt Thrill of the Hunt enters camouflage for up to 12 / 16 / 20 seconds, gaining 40% bonus movement speed. Attacking or casting most spells breaks camouflage.
  • TwitchSquare Twitch's Ambush Ambush enters camouflage after 1 second for 10 / 11 / 12 / 13 / 14 seconds, gaining 10% bonus movement speed, increased to 30% while moving towards nearby enemy champions who cannot see him. Attacking or casting spells breaks camouflage.

Invisibility

Invisibility is a form of stealth that is activated while in-combat to grant a champion a reprieve, or the ability to reposition.
  • Invisible units can only be revealed by enemy turrets or True Sight icon true sight and will briefly shimmer whenever they take damage (e.g. if hit by a skill shot). A unit cannot shimmer more frequently than once per second, and shimmering doesn't make a unit targetable nor remove the stealth effect.
  • Effects that grant unit-vision (but not True Sight icon true sight) will still debuff invisible enemies, including visible over-head indicators, but will not grant unit-vision or targetability.
  • Oracle Alteration item Oracle Alteration and Sweeping Lens item Sweeping Lens will outline invisible units.
Champions
  • AkaliSquare Akali's Twilight Shroud Twilight Shroud, while inside the smoke cover, Akali immediately gains invisibility and 20 / 40 / 60 / 80 / 100% bonus movement speed. If Akali uses a basic attack or ability inside her smoke cover, she will reveal herself for 0.65 seconds.
  • Kha'ZixSquare Kha'Zix's Void Assault Void Assault enters invisibility for 1.5 seconds, gaining 40% bonus movement speed and ignoring unit collision for the duration. After 2 seconds of leaving stealth, and for the next 10 seconds, Void Assault can be cast a second time at no cost.
    • Kha'ZixSquare Kha'Zix's Evolved Active Camouflage Evolved Void Assault, while out of combat, Kha'Zix passively gains Void Assault for 3 seconds in brush. This persists for up to 1.5 seconds after exiting the brush (10 second per brush cooldown).
  • ShacoSquare Shaco's Deceive Deceive enters invisibility after 0.125 seconds for 1.5 / 2.25 / 3 / 3.75 / 4.5 seconds. Shaco remains Twilight Shroud invisible even while casting Hallucinate Hallucinate. Casting Jack in the Box Jack in the Box briefly reveals Shaco's position, but doesn't make him targetable.
  • TalonSquare Talon's Shadow Assault Shadow Assault enters invisibility for up to 2.5 seconds, gaining 40 / 55 / 70% bonus movement speed. Basic attacking or casting an ability breaks invisibility.
  • TeemoSquare Teemo's Guerrilla Warfare Guerrilla Warfare enters invisibility if he stands still for 1.5 seconds without acting or being acted upon. He will remain stealthed so long as he doesn't move, doesn't act, or is Airborne icon displaced. If within a Brushmaker brush, Teemo gains stealth after 0.75 seconds even while moving and may move freely within its boundaries without breaking stealth.
  • VayneSquare Vayne's Final Hour Final Hour, while active, empowers Tumble Tumble to turn Vayne invisible for 1 second on cast. Basic attacking or casting an ability breaks invisibility.
  • WukongSquare Wukong's Decoy Decoy enters invisibility for 1.5 seconds. Basic attacking or casting an ability breaks invisibility.

Stealthed traps

Stealthed traps have a unique form of stealth that cannot be seen except through Hextech Sweeper item Arcane Sweeper, Control Ward item Control Wards, Oracle Alteration item Oracle Alteration, Scryer's Bloom Scryer's Bloom, Sweeping Lens item Sweeping Lens or an enemy turret.
Champions
  • ShacoSquare Shaco's Jack in the Box Jack in the Box summons a box at the target location, which stealths after 2 seconds, lasting up to 60 (+ 5% AP) seconds
  • JhinSquare Jhin's Captive Audience Captive Audience places a Lotus Trap at the target location that lasts for 2 minutes. The Lotus Trap blooms if an enemy walks over it,  revealing all enemies caught inside for 4 seconds.
  • NidaleeSquare Nidalee's Bushwhack Bushwhack lays a trap at the target location, which stealths and arms after a brief delay and lasting for up to 2 minutes. The next enemy who springs the trap takes magic damage over 4 seconds granting True Sight for the duration.
  • TeemoSquare Teemo's Noxious Trap Noxious Trap tosses a mushroom trap on the ground, which stealths and arms after 1 second, lasting up to 5 minutes. While armed, mushrooms grant Sight icon sight in a 212.5-range radius.
Items

Stealth Ward icon Stealth Wards or Totem Ward icon Totem Wards from:

Vanish

Vanish briefly removes a unit from the game, rendering them untargetable, invulnerable, and completely undetectable/invisible even when under Oracle Alteration item Oracle Alteration or Sweeping Lens item Sweeping Lens. Tethered abilities will persist Vanish depending on the refresh rate (i.e. how often the tether checks if the target is still present).
Champions

Invisibility detection

There are various ways for a champion to gain the ability to see stealth. A champion with this ability will see stealthed enemy units as partially translucent. When a revealed stealthed unit leaves the revealed area that unit does not experience a fade time; the unit immediately turns stealthed again. The following is a list of possible ways to detect stealthed champions:

Items

  • Control Ward item Control Ward - Gold 75
    • Consume: Places a visible Control Ward icon Control Ward at the target location (600 range), which grants vision over the surrounding area as well as:
  • Revealing and Disabled Ward icon disabling enemy wards
  • Revealing enemy Noxious Trap stealthed traps.
  • Revealing Ambush 2 Camouflaged champions.
    • Limitations: Can only carry 3 Control Wards in inventory. Limit 1 Control Ward on the map per player.
    • Availability: Summoner's Rift
  • Oracle's Extract item Oracle's Extract - Gold 300
    • Consume: Grants True Sight icon True Sight as well as the ability to detect hidden units within a 500-unit detection radius for 5 minutes. The detection will ignore terrain and brush.
  • True Sight icon True Sight will reveal both stealthed and invisible enemies.
  • Detection highlights units and traps as a red silhouette.
  • Oracle Alteration item Oracle Alteration - Free
    • Active: Summons a Sweeper Drone icon Sweeper Drone that escorts you for the next 10 seconds (76 - 60 (based on level) second cooldown). The drone has a 660 / 690 / 720 / 750-unit detection radius.
    • Limitations: Limited to 1 Trinket. Switching to a Totem-type Trinket will disable Trinket use for 120 seconds. Cannot be purchased until level 9.
    • Availability: Summoner's Rift
  • Sweeping Lens item Sweeping Lens - Free
    • Active: Summons a Sweeper Drone icon Sweeper Drone at the target location for 6 seconds (500 / 800 / 1100 / 1400 / 1700 / 2000 cast range; 90 - 60 (based on level) second cooldown). The drone has a 450 / 475 / 500 / 525 / 550 / 575-unit detection radius.
    • Limitations: Limited to 1 Trinket. Trinkets cannot be used in the first 30 seconds of a game. Selling a Trinket will disable Trinket use for 120 seconds.
    • Availability: Summoner's Rift

Champion abilities

The following abilities can reveal stealthed units for a period of time:

Turrets

Allied turrets have a "true sight" stealth detection range that will reveal any stealthed unit. This range is equal to the turret's attack range. Note that neither inhibitors nor nexuses possess this property.

Items breaking Invisibility

The following in-game elements will break Invisibility upon activation.

Items
Trinkets

Items not breaking Invisibility

The following in-game elements will not break Invisibility upon activation.

Consumables
Items
Trinkets

Presence detection without reveal

All abilities that do not require single target to cast can affect stealthed champions (but will not reveal them).

Certain abilities can only be cast if an enemy is in range of the AoE casting circle - these abilities will light up and become available to use even if the only enemy in range is a stealthed enemy.

  • HecarimSquare Hecarim's Spirit of Dread Spirit of Dread can reveal the position of stealthed champions due to the particle that it generates. The champion will not be revealed.
  • CamilleSquare Camille's Hookshot Hookshot can detect stealthed champions because gains extra range when it hits the wall with an enemy nearby, including stealthed ones. The champion will not be revealed.
  • KatarinaSquare Katarina's Death Lotus Death Lotus can detect stealthed champions due to its working mechanic - can only be used if there's an enemy champion (even stealthed) in its casting range.
  • KennenSquare Kennen's Electrical Surge Electrical Surge can detect stealthed champions due to the particle effect pointing in their direction. The stealthed champion will not be revealed.
  • MorganaSquare Morgana's Soul Shackles Soul Shackles can detect stealthed champions due to its working mechanic - can only be used if there's an enemy champion (even stealthed) in its casting range.
  • NocturneSquare Nocturne's Duskbringer Duskbringer will provide semi-reveal if it lands. Though stealthed unit will still be immune to auto attacks and targeted spells, Duskbringer's trail will compromise the position of said unit for 5 seconds, even through movement.
  • Rek'SaiSquare Rek'Sai's Burrow Tremor Senses will perceive the position of any moving unit, even stealthed ones.
  • SorakaSquare Soraka's Starcall Starcall heal animation shows if the skillshot hit a champion, whether it's invisible or not.
  • TalonSquare Talon's Blade's End Blade's End causes struck enemies to leave behind a trail of blood even during stealth, similarly to NocturneSquare Nocturne's aforementioned Duskbringer Duskbringer.
  • TeemoSquare Teemo's Noxious Trap Noxious Trap will explode but not reveal stealthed champions.
  • TryndamereSquare Tryndamere's Mocking Shout Mocking Shout can detect stealthed champions due to its working mechanic - can only be used if there's an enemy champion (even stealthed) in its casting range.
  • ViktorSquare Viktor's Chaos Storm Chaos Storm will follow a stealthed target and fire it's lightning bolts at it. The stealthed champion will not be revealed.
  • VladimirSquare Vladimir's Tides of Blood Tides of Blood can detect stealthed champions due to the particle effect flying in their direction. The stealthed champion will not be revealed.
  • WarwickSquare Warwick's Blood Hunt Blood Hunt does not reveal stealthed champions but if they are below half health, he will receive the blood trail and the movement speed bonus.

Skill shots

While skill shots that do damage and/or stun such as AsheSquare Ashe's Enchanted Crystal Arrow Enchanted Crystal Arrow will still hit stealthed champions, they will still not be revealed. Note that the visible projectile will stop short of its trajectory and show visual and audio effects (e.g. Dr. MundoSquare Dr. Mundo's Infected Cleaver Infected Cleaver will make a splatter and show a small eruption of blood upon impact) if a stealthed unit is hit, indicating the stealthed champion's presence but not revealing them. Here are some more ways to detect stealthed enemies since they'll function the same as if they are unseen in brush.

Forcing enemies out of stealth

Taunting a stealthed enemy will cause him to attack, automatically revealing him and forcing him out of stealth. This can work if you target a visible stealthed unit or if the enemy is currently entering into stealth. With AoE taunts you can force every stealthed champion in the area to attack, even if they are invisible. Note that RammusSquare Rammus' Frenzying Taunt Frenzying Taunt can't be casted on stealth champions.

In the case of TeemoSquare Teemo's Guerrilla Warfare Guerrilla Warfare, direction targeted skills which can Airborne icon displace, Charm icon charm or Flee icon flee him will force him out of stealth.