A Mejora (buff) is any status effect given to a champion or minion that gives it a beneficial performance boost. The opposite is called a debuff. Upgrades can benefit almost any character's attributes, such as health, mana, attack damage, and ability power, but in some cases they can provide more than a mere stat change. Most of the best are temporary, but some can last indefinitely (such as 
In the sights of 
Tristana, which grants a permanent range increase for attack distance and abilities). Many, but not all, are lost upon death.
Some upgrades can stack a specified number of times, but most don't stack on their own. This means that repeated applications of the buff on the same target will not grant any increased effect and will only cause the duration of the buff to reset.
Certain abilities that have a unique cooldown before they can be used on the same enemy twice such as 
Blade to the Wind of 
Yasuo and 
Bear position 
Udyr are not considered buffs applied to an enemy.
There are several sources of improvements in League of Legends; specifically, abilities, epic monsters, specific field upgrades, items, relics, speed altars, and summoner spell.
Champion abilities
Indefinitely
Blood Well of 
Aatrox- Discipline of Power Discipline of Power of
Akali 
Tantrum 
Amumu (Pasiva)- Deadly Cadence Deadly Cadence of
Cassiopeia 
devour of 
Cho'Gath
Apprehend from 
Darius (Passive)
Silver Moon Razor 
Diana
Adrenaline rush of 
Dr. World- Swarm of Spiders Swarm of Spiders of
Elise y 
Swift Frenzy (Passive) 
Lunge of 
Fiora (Pasiva)
Swift Fighter of 
Fizz- Runic Skin Runic Skin of
Gallium - Raising Morale Raising Morale
Gangplank (Pasiva) 
Courage of 
Garen (Passive)
War Trail of 
hecarim- Technoturgical Repair Bots Technoturgical Repair Bots
Heimerdinger (Aura) 
Wind in Favor of 
Janna (Aura)
Demacian Banner of 
Jarvan IV (Liabilities)
Void Stone of 
Kassadin
Voracity of 
Katarina
Caustic drool of 
Kog'Maw (Liabilities)- Brutal Attacks Brutal Attacks of
Malphite (Pasiva) 
Siphon of the Soul of 
Morgana
Soul Devourer of 
Nasus
Mantle of Darkness 
Night (Passive)
Berserker's Wrath by 
Last the 
Ragnarok (Passive)- Sure Death Sure Death Sure Death of
Pantheon - Brave Fighter Brave Fighter of
poppy 
Spike Shell 
Rammus
Electric discharge of 
Pure (Liabilities)- Daughter of the Dragon Daughter of the Dragon of
Shyvana - Stronghold Stronghold Stronghold of
singed 
Soul Furnace 
Zion (Passive Life Gain)
In the sights of 
Tristana
Battle Fury of 
Tryndamere y 
Bloodlust
Turtle Position Udyr (Lingering effect)- Balance balance
Weighs 
Crimson Pact of 
Vladimir
Path of the Wanderer - Intent by Yasuo
Living Shadow of 
Zed (Pasiva)- Intensive Learning Intense Learning of
Zilean (Aura) 
Rampant Growth of 
Office (Liabilities)
Conditionally undefined
- Shadow Steps Shadow Steps
Evelynn (lasts until damaged) 
Perseverance of Garen (lasts until taking damage from an enemy champion, tower, or monster)
Ionian fervor of 
Irelia (needs an enemy champion nearby)
Zephyr of Janna (Passive) (lasts while on cooldown)
Estilo Wuju de 
Master Yi (Passive) (lasts while on cooldown)
Alarde of 
Miss Fortune (lasts until damaged)
Double Edged Poison 
Shaco (lasts while on cooldown)
Fragmentation of 
Taric (Passive) (lasts while on cooldown)
Rapid movement of 
Teemo (Passive) (lasts until damaged)
Stone Skin 
Wukong (needs an enemy champion nearby)
Temporary
Massacre of Aatrox
Twilight Mantle of Akali
Unwavering Will of 
Alistar
Rebirth of 
Anivia
Molten Shield of 
Annie
concentration 
Ashe
Overdrive of 
Blitzcrank
Hemorrhage from Darius
masochism of Dr. Mundo and 
Sadism
Bloody Impulse of 
Draven- Swift Frenzy of Elise (Assets)
- Dark Frenzy Dark Frenzy of Evelynn and Desolar Desolar
Increasing Spell Strength of 
Ezreal and 
Essence Flow (on an ally)- Duelist Duelist of Fiora and Speed Burst Speed Burst
Bulwark of Gallium- Raising Morale Raising Morale Gangplank (Activa) (Aura)
- Courage of Yarn (Assets)
Gene of Fury, 
Hyper and 
earring of 
Gnar
Happy hour 
Gragas and 
Drunken Fury- True Value True Value of
Graves and 
Quick Shot 
Devastating Charge of hecarim
UPGRADE! from Heimerdinger
Eye of the Storm Janna- Demacian Banner of Jarvan IV (Activa) (Aura)
Relentless Assault of 
Jax y 
Grandmaster's Force (Active)
Hextech capacitor 
Jayce, 
Acceleration Portal and 
Hyperload
Get excited! from 
Jinx
Inspiration from 
Karma and 
Challenge of Karma (Aura)- Divine Blessing Divine Blessing of
Kayle, Intervention Intervention and Righteous Fury Righteous Fury 
Lightning Boost of 
Kennan
Void Attack of 
Kha'Zix- Bio-arcana Download Bio-arcana Download Kog'Maw
Burst of 
Lee Sin and 
Iron will
Eclipse of 
Leona- Daughter of Ice Daughter of Ice of
Lissandra y 
Frozen Tomb (self-cast) 
Burning Glow of 
Lucian (by impact)
Seismic Fragment of malphite
Double Hit of Maestro Yi, 
Meditation, Wuju Style (Active) and 
Unstoppable- Impure Shots Impure Shots of Miss Fortune (Activa)
- Sneaky Death Sneaky Death of
Mordekaiser 
Swell of 
Nami y 
Blessing of the Tide
Fury of the Sands Nasus
Prowl 
Nidalee and 
Primitive Outburst of Nidalee
Duskbringer of Nocturne (Trace) and Mantle of Darkness (Active)- Visionary Visionary of
Nunu, Voracity and Boiling Blood Boiling Blood 
Bloody Strikes of Last the Ragnarok (Active)- Protecting Aegis Protecting Aegis of Pantheon
- Diplomatic Immunity Diplomatic Immunity of Poppy and Demacian Paragon Demacian Paragon
Keen Senses of 
Quinn (Passive)
Lord of 
Renekton- Empowered Fierceness Empowered Fierceness of
Rengar, 
Battle Roar, Empowered Battle Roar Empowered Battle Roar and 
Hunter's Adrenaline 
Sword of Exile by 
Riven
Scrap Shield of 
Rumble- Desperate Power Desperate Power of Ryze
- Frost Frost of
Sejuani - Fake Fake de
Shen 
Burn of Shyvana- Potion of Insanity Potion of Insanity singed
- cannibalism cannibalism of Sion
Huntress 
Sivir (Aura)
Crystal Slash 
Skarner y 
Crystalline Exoskeleton
Aria's Perseverance 
Sona (Active) (Aura), 
Hymn of Valor (Aura) and 
Song of Celerity (Active) (Aura)- Astral Blessing Astral Blessing of
Soraka 
Shadow Assault of 
Heel
Glow of Taric (Aura)- Camouflage camouflage Teemo and Rapid Movement (Active)
Rapid fire of Tristana
Chew on 
Trundle, 
Frozen Kingdom and 
Subjugate
Immortal Fury of Tryndamere
Ambush of 
Twitch y Ra-ta-ta-ta Ra-ta-ta-ta de Twitch
Monkey Agility Udyr, Bear position Udyr (Activation effect) and 
Tiger Stance (Trigger Effect)- Terrifying Capacitor Terrifying Capacitor of
Urgot and Hyperkinetic Positional Reverter Hyperkinetic Positional Reverter 
Living Vengeance of 
Varus
End time of 
Vayne
Red Tide of Vladimir- Chosen of the Storm Chosen of the Storm
Volibear, Frenzy Frenzy, Thunder Throwing Thunder Throwing and Thunder Claws Thunder Claws - Hunter's Call Hunter's Call
Warwick (Aura) 
Cyclone Wukong- War cry war cry of
Xin Zhao (Active) and Increasing Sweep Increasing Sweep 
Last breath of Yasuo
Unholy Alliance of 
Yorick and 
Harbinger of Death
Let's bounce! from 
Zac
Time travel of Zilean and 
Temporal Distortion of Zilean
Activables
Burning Agony of Dr. World
Arachnid Form / Human Form of Elise- transform transform from Jayce Transform: Mercury Cannon Transform: Mercury Cannon
Change of Arms! from Jinx
Smell of blood Warwick
Neutral improvements
Indefinitely
- Altars (Twisted Treeline)
- Crystal Scar Aura
- Howling Abyss Aura
Matadragones
Temporary
Insight Emblem (Summoner Crack)
Ashes Emblem (Summoner's Rift)- Baron's Hand Baron's Hand (Summoner's Rift)
- Emblem of Crushing Fury Emblem of Crushing Fury (Twisted Treeline)
- Ghost Relic (Twisted Treeline)
- Altars (Twisted Treeline)
- Altar of speed
- Conqueror's Mark (Crystal Scar)
- Greater Relic (Crystal Scar)
Summoner spells
Healing
Flash (with the Distortion Distortion enchantment)
Ghost
Garrison (Crystal Scar)
Purification
Teleportation (with the Distortion Distortion enchantment)
| Champion abilities | |
|---|---|
| Types of targeting | |
|
Self-directed · Terrestrial · Own · Directed · Unitary | |
| Effect types | |
| Aura · Flash · Constant improvement Crowd Control Damage Displacement Weakening Healing Hit Effects Pet Shield Vision | |
