Thunderlord's Decree

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Thunderlord's DecreeEdit
Effects
Hitting an enemy champion with an ability (ability damage) or basic attack (on-hit) marks them with Thunderlord's Decree for 3 seconds. At 3 stacks, the target is dealt 10 − 180 (based on level) + (30% bonus AD) + (10% AP) magic damage in an area around them. Thunderlord's Decree can only be triggered once every 25 − 15 (based on level) seconds. Persistent area of effects, such as Fiddlesticks' Crowstorm and Morgana's Tormented Soil, hit with each application of damage. Applied damage over time effects, like Fiddlesticks' Drain or Swain's Torment, only hit once.
Cunning
Tier	6
Rank	1
Point req.	17

Cunning Tree
Other Mastery Trees:
Ferocity • Resolve

Thunderlord's Decree is a tier 6 Cunning Keystone mastery.

Notes

• Thunderlord's Decree's cooldown is general (not per-target)

Trivia

•  Deathfire Touch will apply more damage on one single-target spell (i.e. over 4 seconds) than Thunderlord's Decree if a champion has more than 573 bonus AD or more than 1146 AP.

Patch History

V7.22

• Removed due to Season 2018.
• Replaced by Electrocute.

V6.11

• Bug Fix: Cooldown no longer resets on certain revive effects, such as Karthus' Death Defied or Yorick's Omen of Death.

V6.2

• Cooldown changed to 25 − 15 (based on level) seconds from 20 at all levels.
• Stack duration reduced to 3 seconds from 5 seconds.

V5.24

• AD ratio increased to 30% bonus AD from 20% bonus AD.

V5.23

• Cooldown reduced to 20 seconds from 30.

November 17th Hotfix

• Bug Fix: Fixed a bug where the per-target cooldown was unique across multiple champions with the mastery.

V5.22

• Added
• Tier 6 Cunning Keystone mastery with 1 rank.
• Hitting an enemy champion with an ability (ability damage) or basic attack (on-hit) marks them with Thunderlord's Decree for 5 seconds. At 3 stacks, the target takes 10 − 180 (based on level) (+ 20% bonus AD) (+ 10% AP) magic damage. Thunderlord's Decree can only be triggered once every 30 seconds.