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Gem of Storm's Eye
Gem
Level105
Uncommon
Gem of Storm's Eye
+4
Lightning Damage on Chain Lightning
Hitting an enemy puts a mark on them for 5s. Hitting a marked enemy sends a lightning bolt to another marked enemy, dealing 4 damage. The attack can chain to more marked enemies. After lightning triggers, the effect has a 1s cooldown before it can retrigger from the same enemy. After the cooldown, the mark is refreshed.
Added in the update: Thralls of Twilight