Buff

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Not to be confused with making a game feature more powerful via a patch

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 and Udyr's Bear Stance 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

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

Toggled

• Dr. Mundo's Burning Agony
• 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

Temporary

Summoner's Rift

Twisted Treeline

• Crest of Crushing Wrath
• Ghost Relic
• Altars

Crystal Scar

• Speed Shrine
• Greater Relic

Summoner spells