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Your glorious sacrifice
warlock (dark) attack 1

Target: one creature

Attack: Charisma vs. Fortitude
Before the attack, this power's user may deal damage equal to the user's Charisma modifier to an adjacent ally. If the user does so, this power's attack roll gains a +2 bonus.

Hit: "3d8 + Charisma modifier damage. If you dealt damage to an ally as part of this power, the target takes ongoing poison damage equal to your Charisma modifier (save ends)."
Dark Pact: "The ongoing damage is instead equal to your Intelligence modifier + your Charisma modifier."

Miss: "Half damage, and no ongoing damage."[FRPG:36]

Your glorious sacrifice is a daily power available to warlocks at 1st level.