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Chromatic bolt
warlock attack 1

Target: one creature

Attack: Charisma vs. Reflex

Hit: "1d8 + Charisma modifier psychic damage, and one creature within 5 squares of the target takes psychic damage equal to your Constitution modifier."
Level 21: "2d8 + Charisma modifier psychic damage, and psychic damage equal to 3 + your Constitution modifier."[HotEC:102]

Chromatic bolt is an at-will power available to warlocks at 1st level. It is granted automatically to warlocks who choose the elemental pact option for their Eldritch Pact.