Hellish rebuke
warlock (infernal) attack 1

Target: one creature

Attack: Constitution vs. Reflex

Hit: "1d6 + Constitution modifier fire damage. The first time you take damage before the end of your next turn, the target takes 1d6 + Constitution modifier fire damage."
Level 21: "2d6 + Constitution modifier damage and extra damage."[PH:132][U:W]

Hellish rebuke is an at-will power available to warlocks at 1st level. Either gift to Avernus or hellish rebuke is granted automatically to warlocks who choose the infernal pact option for their Eldritch Pact.

The warlock update clarified that hellish rebuke's extra damage is dealt only once.

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