Your weapon turns black when it strikes and causes your target to dissolve before your eyes.

Daily   ✦     Elemental, Necrotic
No Action      Special

Trigger: You hit an enemy with a melee weapon attack.

Effect: The enemy takes 2[W] extra damage, and it takes ongoing 20 necrotic damage (save ends). If any of this damage reduces the enemy to 10 hit points or fewer, it dies.

  Aftereffect: Ongoing 10 necrotic damage (save ends).

Published in Heroes of the Elemental Chaos, page(s) 124.