It's not pretty, it's not kind, but sometimes you need to draw power from an ally's pain.

Encounter   ✦     Arcane, Healing
Immediate Reaction      Ranged 10

Trigger: An ally within 10 squares of you takes damage

Effect: You gain a +2 power bonus to one attack roll before the end of your next turn.

  Dark Pact: You regain hit points equal to your Charisma modifier.

  Infernal Pact: You gain temporary hit points equal to twice your Constitution modifier.

Published in Arcane Power, page(s) 77.