Stealth

'''Stealth''' is the mechanic by which some units become invisible for a determined period of time. '''Stealth''' is divided into three categories: {{tip|Camouflage}} (also known as Strategic stealth), {{tip|Invisibility}} (also known as Tactical stealth) and {{tip|stealthed trap|Stealthed traps}}.

== Camouflage ==
<div style="margin:0 0 1em 1em;">{{tip info|camouflage}}</div>
<div style="margin:0 0 0 3em;">[[File:Invisibility Shimmer.gif|left|400px]]</div>{{clr}}

;Champions
* {{cai|Demon Shade|Evelynn}}, starting from level 6, allows her to permanently enter camouflage after being out-of-combat for 4 seconds.
* {{cai|Thrill of the Hunt|Rengar}} enters camouflage for up to {{ap|12|16|20}} seconds, gaining 40% bonus movement speed. Attacking or casting most spells breaks camouflage.
* {{cai|Ambush|Twitch}} enters camouflage after 1 second for {{ap|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 ==
<div style="margin:0 0 1em 1em;">{{tip info|invisibility}}</div>

;Champions
* {{cai|Twilight Shroud|Akali}}, while inside the smoke cover, '''Akali''' immediately gains invisibility and {{ap|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 {{fd|0.65}} seconds.
* {{cai|Void Assault|Kha'Zix}} enters invisibility for {{fd|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.
** {{cai|Evolved Adaptive Cloaking|Kha'Zix|Evolved Void Assault}}, while out of combat, '''Kha'Zix''' passively gains ''Void Assault'' for {{fd|3}} seconds in brush. This persists for up to {{fd|1.5}} seconds after exiting the brush (10 second per brush cooldown). 
* {{cai|Deceive|Shaco}} enters invisibility after {{fd|0.125}} seconds for {{ap|1.5|2.25|3|3.75|4.5}} seconds. '''Shaco''' remains {{tip|invisibility|invisible}} even while casting {{ai|Hallucinate|Shaco}}. Casting {{ai|Jack in the Box|Shaco}} briefly reveals '''Shaco's''' position, but doesn't make him targetable.
* {{cai|Shadow Assault|Talon}} enters invisibility for up to {{fd|2.5}} seconds, gaining {{ap|40|55|70}}% bonus movement speed. Basic attacking or casting an ability breaks invisibility.
* {{cai|Guerrilla Warfare|Teemo}} enters invisibility if he stands still for {{fd|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 {{tip|airborne|displaced}}. If within a {{ai|Brushmaker|Brush|brush}}, '''Teemo''' gains stealth after {{fd|0.75}} seconds even while moving and may move freely within its boundaries without breaking stealth.
* {{cai|Final Hour|Vayne}}, while active, empowers {{ai|Tumble|Vayne}} to turn '''Vayne''' invisible for 1 second on cast. Basic attacking or casting an ability breaks invisibility.
* {{cai|Decoy|Wukong}} enters invisibility for {{fd|1.5}} seconds. Basic attacking or casting an ability breaks invisibility.

== Stealthed traps ==
<div style="margin:0 0 1em 1em;">{{tip info|stealthed trap}}</div>

;Champions
* {{cai|Jack in the Box|Shaco}} summons a box at the target location, which stealths after 2 seconds, lasting up to 60 {{as|(+ 5% AP)}} seconds
* {{cai|Captive Audience|Jhin}} 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.
* {{cai|Bushwhack|Nidalee}} 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.
* {{cai|Noxious Trap|Teemo}} tosses a mushroom trap on the ground, which stealths and arms after 1 second, lasting up to 5 minutes. While armed, mushrooms grant {{tip|sight}} in a {{fd|212.5}}-range radius.

;Items
{{tip|Stealth Ward|Stealth Wards}} or {{tip|Totem Ward|Totem Wards}} from:
* {{ii|Eye of the Equinox}}
* {{ii|Eye of the Oasis}}
* {{ii|Eye of the Watchers}}
* {{ii|Ruby Sightstone}}
* {{ii|Sightstone}}
* {{ii|Tracker's Knife}}
* {{ii|Warding Totem}}

== Vanish ==
<div style="margin:0 0 1em 1em;">{{tip info|vanish}}</div>

;Champions
* {{cai|Mimic|LeBlanc}} vanishes for {{fd|0.1}} seconds upon casting an empowered basic ability.
* {{cai|Void Rush|Rek'Sai}} vanishes for {{fd|1.5}} seconds.
* {{cai|Hallucinate|Shaco}} vanishes for {{fd|0.5}} seconds.
* {{cai|Death Mark|Zed}} vanishes for {{fd|0.75}} seconds.

== 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 ===
* {{ii|Control Ward}} - {{g|{{Item data Control Ward|pst2|buy}}}}
** {{sbc|Consume:}} {{Item data Control Ward|pst2|consume}}
** {{sbc|Limitations:}} {{Item data Control Ward|pst2|limit}} {{Item data Control Ward|pst2|pass}}
** {{sbc|Availability:}} [[Summoner's Rift]]
* {{ii|Oracle's Extract}} - {{g|{{Item data Oracle's Extract|pst2|buy}}}}
** {{sbc|Consume:}} {{Item data Oracle's Extract|pst2|consume}}
** {{sbc|Availability:}} [[Howling Abyss]].
* {{ii|Oracle Alteration}} - Free
** {{sbc|Active:}} {{Item data Oracle Alteration|pst2|act}}
** {{sbc|Limitations:}} {{Item data Oracle Alteration|pst2|limit}} {{Item data Oracle Alteration|pst2|req}}
** {{sbc|Availability:}} [[Summoner's Rift]]
* {{ii|Sweeping Lens}} - Free
** {{sbc|Active:}} {{Item data Sweeping Lens|pst2|act}}
** {{sbc|Limitations:}} {{Item data Sweeping Lens|pst2|limit}}
** {{sbc|Availability:}} [[Summoner's Rift]]

=== Champion abilities ===
The following abilities can reveal stealthed units for a period of time:
* {{cai|Yordle Snap Trap|Caitlyn}} and  {{ai|Ace in the Hole|Caitlyn}}, if her target stealths themselves during the channel.
* {{cai|Chum the Waters|Fizz}} will reveal a stealthed unit if this attaches to the fish.
* {{cai|Focused Resolve|Karma}} and {{ai|Renewal|Karma}}
* {{cai|Sonic Wave|Lee Sin}}
* {{cai|Help, Pix!|Lulu}} will reveal enemies if they stealth themselves while Pix is attached to them.
* {{cai|Soul Shackles|Morgana}}
* {{cai|Prowl|Nidalee|Hunt}}
* {{cai|Thrill of the Hunt|Rengar}} reveals the closest enemy champion.
* {{cai|Destiny|Twisted Fate}} will reveal all enemy champions.
* {{cai|Rampant Growth|Zyra}} will reveal stealthed units that step over the seeds.

=== 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
{{column|2|
* {{ii|Bilgewater Cutlass}}
* {{ii|Blade of the Ruined King}}
* {{ii|Hextech GLP-800}}
* {{ii|Hextech Gunblade}}
* {{ii|Hextech Protobelt-01}}
* {{ii|Locket of the Iron Solari}}
* {{ii|Mikael's Crucible}}
* {{ii|Randuin's Omen}}
* {{ii|Ravenous Hydra}}
* {{ii|Redemption}}
* {{ii|Righteous Glory}}
* {{ii|Talisman of Ascension}}
* {{ii|Tiamat}}
* {{ii|Wooglet's Witchcap}}
* {{ii|Zhonya's Hourglass}}
}}
;Trinkets
* {{ii|Sweeping Lens}}
* {{ii|Oracle Alteration}}

== Items not breaking Invisibility ==
The following in-game elements will '''not''' break Invisibility upon activation.
;Consumables
{{column|2|
* {{ii|Control Ward}}
* {{ii|Corrupting Potion}}
* {{ii|Elixir of Iron}}
* {{ii|Elixir of Sorcery}}
* {{ii|Elixir of Wrath}}
* {{ii|Health Potion}}
* {{ii|Hunter's Potion}}
* {{ii|Refillable Potion}}
* {{ii|Total Biscuit of Everlasting Will}}
}}
;Items
{{column|2|
* {{ii|Banner of Command}}
* {{ii|Edge of Night}}
* {{ii|Eye of the Equinox}}
* {{ii|Eye of the Oasis}}
* {{ii|Eye of the Watchers}}
* {{ii|Face of the Mountain}}
* {{ii|Frost Queen's Claim}}
* {{ii|Knight's Vow}}
* {{ii|Mercurial Scimitar}}
* {{ii|Quicksilver Sash}}
* {{ii|Ruby Sightstone}}
* {{ii|Seraph's Embrace}}
* {{ii|Sightstone}}
* {{ii|Tracker's Knife}}
* {{ii|Youmuu's Ghostblade}}
* {{ii|Zeke's Convergence}}
* {{ii|Zz'Rot Portal}}
}}
;Trinkets
* {{ii|Farsight Alteration}}
* {{ii|Warding Totem}}

== 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.
* {{cai|Spirit of Dread|Hecarim}} can reveal the position of stealthed champions due to the particle that it generates. The champion will not be revealed.
* {{cai|Hookshot|Camille}} 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. 
* {{cai|Death Lotus|Katarina}} 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.
* {{cai|Electrical Surge|Kennen}} can detect stealthed champions due to the particle effect pointing in their direction. The stealthed champion will not be revealed.
* {{cai|Soul Shackles|Morgana}} 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.
* {{cai|Duskbringer|Nocturne}} 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.
* {{cai|Burrow|Rek'Sai|Tremor Senses}} will perceive the position of any moving unit, even stealthed ones.
* {{cai|Starcall|Soraka}} heal animation shows if the skillshot hit a champion, whether it's invisible or not.
* {{cai|Blade's End|Talon}} causes struck enemies to leave behind a trail of blood even during stealth, similarly to {{Ci|Nocturne}}'s aforementioned {{Ai|Duskbringer|Nocturne}}.
* {{cai|Noxious Trap|Teemo}} will explode but not reveal stealthed champions.
* {{cai|Mocking Shout|Tryndamere}} 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.
* {{cai|Chaos Storm|Viktor}} will follow a stealthed target and fire it's lightning bolts at it. The stealthed champion will not be revealed.
* {{cai|Tides of Blood|Vladimir}} can detect stealthed champions due to the particle effect flying in their direction. The stealthed champion will not be revealed.
* {{cai|Blood Hunt|Warwick}} 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 {{cai|Enchanted Crystal Arrow|Ashe}} 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. {{cai|Infected Cleaver|Dr. Mundo}} 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 [[Brush#Detecting enemies with skill shots|detect stealthed enemies]] since they'll function the same as if they are unseen in brush.
* {{cai|Light Binding|Lux}} will visibly entrap the stealthed champion without revealing the champion.
* {{cai|Dark Binding|Morgana}} will visibly entrap the stealthed champion without revealing the champion.
* {{cai|Chain of Corruption|Varus}} will visibly entrap the stealthed champion without revealing the champion.
* {{cai|Grasping Roots|Zyra}} will visibly entrap the stealthed champion without revealing the champion.
* Hook-type skillshots ({{cai|Dredge Line|Nautilus}}, {{cai|Rocket Grab|Blitzcrank}}, {{cai|Bandage Toss|Amumu}} and in some circumstances, {{cai|Zenith Blade|Leona}} and {{cai|Death Sentence|Thresh}}) will show the effect of the hook happening without revealing the stealthed champion hit, revealing the champion's location.
* {{cai|Rising Spell Force|Ezreal}} will grant him a stack for each champion hit with his abilities, revealing if there are stealthed champions nearby.

=== 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 {{cai|Frenzying Taunt|Rammus}} can't be casted on stealth champions.
* {{cai|Shield of Durand|Galio}}
* {{cai|Shadow Dash|Shen}}

In the case of {{cai|Guerrilla Warfare|Teemo}}, direction targeted skills which can {{tip|airborne|displace}}, {{tip|charm}} or {{tip|flee}} him will force him out of stealth.

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