You use one death as the seed to sow more destruction.

Encounter ✦     Necrotic
Free Action  

Trigger: A creature within 5 squares of you is reduced to 0 hit points

Effect: One creature of your choice that you hit with an attack before the end of your next turn takes extra necrotic damage equal to 1d8 + your Constitution modifier or Charisma modifier.

Update (9/29/2011)
Changed in October 2011 update.

Published in Dragon Magazine 376, page(s) 35, Heroes of Shadow, page(s) 116.