63026718
Gem of Focused Light
Gem
Level105
Legendary

+10
Damage
+100%
of Base Damage at 1 Stack
+225%
of Base Damage at 2 Stacks
+450%
of Base Damage at 3 Stacks
Targeting an enemy for a few seconds while aiming or blocking puts a
mark on the enemy. Attacking the marked enemy deals 10 additional fire damage. The mark can stack up to 3 times by continued targeting, increasing the bonus damage by 225% at 2 stacks and 450% at 3 stacks.

Added in the update:
Thralls of Twilight
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