King's Wrath

Paragon Tier
Prerequisite: 11th level, warlock, sorcerer-king pact
Benefit: Whenever a nonminion creature cursed by you drops to 0 hit points, you can use a free action to forgo regaining your fell might and instead deal psychic damage to one enemy within 5 squares of the creature that dropped to 0 hit points. The damage equals your Charisma or Constitution modifier.

Published in Dark Sun Campaign Setting, page(s) 115.