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Expose Weakness

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Expose Weakness is a tier 2 Ferocity mastery with 1 rank.[1]


  • The damage increase is capped at 3%, even if multiple allies apply the debuff to a target.[2]
  • Expose Weakness does not amplify your own damage, whether from your own champion or a pet.[3]

Patch History

V6.4 Added
  • Tier 2 Ferocity mastery with 1 rank.
    • Damaging enemy champions causes them to take 3% more damage from your allies.


Offense Mastery Tree
(Season Four)
Double-Edged Sword (Melee:) Increases damage dealt by 2% and damage received by 1%. (Ranged:) Increases damage dealt and received by 1.5%.Fury: Grants 1.25 / 2.5 / 3.75 / 5 % attack speed.Sorcery: Grants 1.25 / 2.5 / 3.75 / 5 % cooldown reduction.Butcher: Basic attacks and single target, non-periodic abilities deal 2 bonus true damage to minions and monsters.Expose Weakness: Your damaging abilities debuff enemies for 3 seconds, increasing the damage they take from allied champions by 1%.Brute Force: Grants 3.96 / 7.02 / 9.9 AD at level 18 (0.22 / 0.39 / 0.55 AD per level).Mental Force: Grants 5.94 / 10.98 / 16.02 AP at level 18 (0.33 / 0.61 / 0.89 AP per level).Feast: You restore 3 health and 1 mana on unit kill.Spell Weaving: Damaging an enemy champion with a basic attack increases the damage dealt by your abilities by 1%, stacking up to 3 times.Martial Mastery: Grants 4 attack damage.Arcane Mastery: Grants 6 ability power.Executioner: Increases damage dealt by 5% to enemy champions below 20 / 35 / 50% health.Blade Weaving: If your damaging abilities damage at least one champion, the damage dealt by your basic attacks is increased by 1% (stacking up to 3 times). This cannot trigger more than once per second.Warlord: Increases your bonus attack damage by 2 / 3.5 / 5%.Archmage: Increases your ability power by 2 / 3.5 / 5%.Dangerous Game: Champion kills and assists restore 5% of your missing health and mana.Frenzy: Grants 5% attack speed for 3 seconds after landing a critical strike. This stacks up to 3 times.Devastating Strikes: Grants 2 / 4 / 6 % armor and magic penetration.Arcane Blade: Your basic attacks deal bonus magic damage equal to 5% of your ability power.Havoc: Increases damage dealt by 3%.Season 4 Offense
Other Mastery Trees:
Defense Mastery DefenseUtility Mastery (tree) Utility
Arcane Knowledge mastery s3
Expose Weakness was a tier 2 offense mastery with 1 rank.

Effect per rank

  • The tool-tip in the game client literally reads
    "Damaging an enemy with a spell increases allied champions' damage to that enemy by 1% for the next 3 seconds."
  • Your damaging abilities debuff enemies for 3 seconds, increasing the damage they take from allied champions by 1%.


  • Requires 4 points in Offense.

Application and synergy

  • The increased damage applies to minions and neutral monsters as well as enemy champions.
  • This mastery only increases allies' damage, not your own.
  • Multiple applications from the same champion refresh the duration.
  • Multiple applications from different champions stack, meaning a full team using Arcane Knowledge mastery s3.png Expose Weakness could impart an additional 4% damage on the 5th spell that hits the same target within 3 seconds.


Patch History

V5.22 Removed
  • Removed due to Season 2016.
V3.14 Added
  • Tier 2 Offense mastery with 1 rank.
    • Your damaging abilities debuff enemies for 3 seconds, increasing the damage they take from allied champions by 1%.

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