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- Not to be confused with making a game feature more powerful via a patch
Vayne using 
Final Hour.
A buff is any status effect given to a champion or a minion that gives them a beneficial boost to their performance. The opposite is called a 
debuff. Buffs can benefit almost any attribute of a character, such as health, mana, attack damage, and ability power, but may provide more than mere statistical changes in some cases. Most buffs are temporary, but some may be permanent (such as 
Tristana's 
Draw a Bead permanently granting a range increase for her attacks and abilities). Most, but not all, are lost upon death. A buff given to Champion B by Champion A, such as 
Lulu's 
Help, Pix!, will apply Champion B's magic penetration, spell vamp, damage modifiers, 
Ravenous Hunter, etc...
Some buffs can stack up to a predetermined number of times, but most buffs will not stack with themselves. This means that repeated applications of the buff to the same target will not grant any increased effect and will only cause the buff duration to reset.
Certain abilities that have a unique cooldown before they can be used on the same enemy twice such as 
Yasuo's 
Sweeping Blade are not considered to be buffs applied to an enemy.
There are several sources for buffs in League of Legends; specifically, abilities, epic monsters, field-specific buffs, items, relics, speed shrines and summoner spells.
Champion abilities
Indefinite
Amumu's Tantrum (Passive)- Aurelion Sol's Center of the Universe and Celestial Expansion (Passive)
- Azir's Arise! (Passive)
- Cassiopeia's Serpentine Grace
- Cho'Gath's Feast
- Darius' Apprehend (Passive)
- Diana's Moonsilver Blade
- Dr. Mundo's Goes Where He Pleases
- Elise's Spider Queen and Skittering Frenzy (Passive)
- Fizz's Nimble Fighter
- Garen's Courage (Passive)
- Hecarim's Warpath
- Janna's Tailwind (Aura)
- Jarvan IV's Demacian Standard (Passive)
- Kassadin's Void Stone
- Katarina's Voracity
- Kayle's Divine Ascent (Passive) (Level 16).
- Kindred's Mark of the Kindred
- Kog'Maw's Caustic Spittle (Passive)
- Malphite's Thunderclap (Passive)
- Morgana's Soul Siphon
- Nasus' Soul Eater
- Nocturne's Shroud of Darkness (Passive)
- Olaf's Berserker Rage and Ragnarok (Passive)
- Poppy's Stubborn to a Fault
- Rammus' Spiked Shell
- Rek'Sai's Void Rush (Passive)
- Ryze's Arcane Mastery
- Shyvana's Fury of the Dragonborn
- Sion's Soul Furnace (Passive)
- Tahm Kench's An Acquired Taste
- Taric's Bastion(Passive)
- Tristana's Draw a Bead
- Tryndamere's Battle Fury and Bloodlust
- Veigar's Phenomenal Evil Power
- Vladimir's Crimson Pact
- Xin Zhao's Determination
- Yasuo's Way of the Wanderer - Intent
- Zed's Reaper of Shadows
- Zyra's Rampant Growth (Passive)
Conditionally Indefinite
- Aatrox's Deathbringer Stance (lasts until the attack is consumed)
- Evelynn's Demon Shade (lasts until damage is taken or dealt)
- Garen's Perseverance (lasts until damage is taken from an enemy champion, tower or monster)
- Heimerdinger's Hextech Affinity (requires a nearby turret)
- Janna's Zephyr (Passive) (lasts while off cooldown)
- Master Yi's Wuju Style (Passive) (lasts while off cooldown)
- Miss Fortune's Strut (lasts until damage is taken)
- Quinn's Behind Enemy Lines (lasts until damage is taken)
- Shaco's Two-Shiv Poison (lasts while off cooldown)
- Tahm Kench's Thick Skin (Passive) (lasts while off cooldown)
- Taliyah's Rock Surfing (lasts until far from a wall or damage is taken)
- Teemo's Move Quick (Passive) (lasts until damage is taken) and Guerrilla Warfare (lasts until Teemo is displaced, performs a non-move action or moves outside of brush)
- Wukong's Stone Skin (requires a nearby enemy champion)
- Taric's Bastion (Passive) (on an ally, lasts until Taric changes targets or is out of range)
- Zilean's Time in a Bottle (lasts until Zilean targets an allied champion)
Temporary
- Aatrox's Umbral Dash and World Ender
- Ahri's Orb of Deception
- Akali's Twilight Shroud
- Alistar's Unbreakable Will
- Anivia's Rebirth
- Annie's Molten Shield
- Ashe's Ranger's Focus
- Bard's Traveler's Call - Chimes and Caretaker's Shrine
- Blitzcrank's Overdrive
- Braum's Unbreakable and Stand Behind Me
- Darius' Hemorrhage - Noxian Might
- Dr. Mundo's Heart Zapper, Dr. Mundo's Blunt Force Trauma, and Maximum Dosage
- Draven's Blood Rush
- Elise's Skittering Frenzy (Active)
- Evelynn's Hate Spike and Whiplash
- Ezreal's Rising Spell Force
- Fiora's Duelist's Dance, Bladework and Grand Challenge
- Gangplank's Trial by Fire and Cannon Barrage (After purchasing Raise Morale)
- Garen's Courage (Active)
- Gnar's Rage Gene, Hyper and Hop
- Gragas' Happy Hour and Drunken Rage
- Graves' Quickdraw
- Hecarim's Devastating Charge
- Heimerdinger's UPGRADE!!!
- Janna's Eye of the Storm
- Jarvan IV's Demacian Standard (Active) (Aura)
- Jax's Relentless Assault and Grandmaster's Might (Active)
- Jayce's Hextech Capacitor, Acceleration Gate and Hyper Charge
- Jinx's Get Excited!
- Karma's Inspire and Defiance (Aura)
- Katarina's Shunpo
- Kayle's Divine Ascent (Pre level 16), Celestial Blessing, Divine Judgement and Starfire Spellblade
- Kennen's Lightning Rush
- Kha'Zix's Void Assault
- Kog'Maw's Bio-Arcane Barrage
- Lee Sin's Flurry and Iron Will
- Leona's Eclipse and Solar Flare
- Lissandra's Iceborn and Frozen Tomb (Self-cast)
- Lucian's Ardent Blaze ( On-hit when attacking Marked target)
- Malphite's Seismic Shard
- Malzahar's Void Shift
- Master Yi's Double Strike, Meditate, Wuju Style (Active) and Highlander
- Miss Fortune's Guns Blazing
- Nami's Surging Tides and Tidecaller's Blessing
- Nasus' Fury of the Sands
- Nidalee's Prowl and Primal Surge
- Nocturne's Duskbringer (Trail) and Shroud of Darkness (Active)
- Olaf's Tough It Out and Ragnarok (Active)
- Ornn's Bellows Breath
- Poppy's Iron Ambassador
- Quinn's Heightened Senses (Passive)
- Renekton's Dominus
- Rengar's Battle Roar and Thrill of the Hunt
- Riven's Blade of the Exile
- Rumble's Scrap Shield
- Ryze's Overload
- Sejuani's Frost Armor
- Seraphine's Stage Presence and Surround Sound (Aura)
- Shen's Ki Barrier and Twilight Assault
- Shyvana's Burnout
- Singed's Insanity Potion and Noxious Slipstream
- Sion's Soul Furnace (Active)
- Sivir's On the Hunt (Aura)
- Skarner's Crystal Slash and Crystalline Exoskeleton
- Sona's Aria of Perseverance (Active) (Aura), Hymn of Valor (Aura) and Song of Celerity (Active) (Aura)
- Talon's Shadow Assault
- Taliyah's Threaded Volley
- Taric's Bravado and Bastion (Active)
- Teemo's Move Quick (Active)
- Tristana's Rapid Fire
- Trundle's Chomp, Frozen Domain and Subjugate
- Tryndamere's Undying Rage
- Twitch's Ambush and Spray and Pray
- Urgot's Purge
- Varus' Living Vengeance
- Vayne's Final Hour
- Vladimir's Transfusion and Sanguine Pool
- Volibear's The Relentless Storm, Thundering Smash, and Stormbringer
- Wukong's Cyclone
- Xin Zhao's Audacious Charge and Crescent Guard (Awareness zone)
- Yasuo's Last Breath
- Zac's Let's Bounce!
- Zilean's Chronoshift and Time Warp
Toggled
- Elise's Spider Form / Human Form
- Jayce's Transform Mercury Hammer / Cannon
- Jinx's Switcheroo! / Pow-Pow
- Rek'Sai's Burrow / Unburrow
Neutral buffs
These buffs come from monsters or structures and can be claimed by either team.
Indefinite
- Dragon Slayer (Summoner's Rift)
- Altars (Twisted Treeline)
- Crystal Scar's Aura
- Howling Abyss' Aura
Temporary
Summoner's Rift
Twisted Treeline
Crystal Scar
Summoner spells
