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Hunger of hadar
Warlock (Star) Attack 5

You create a zone of complete, impermeable darkness filled with flying, fluttering, fanged shadows. The shadows rend at the very life force of creatures caught within.

area burst 1 within 10 squares

Effect: The burst creates a zone of darkness until the end of your next turn, blocking line of sight. Creatures that enter the zone or start their turns there take 2d10 necrotic damage.

Sustain minor: When you sustain the power, you make a secondary attack.

Secondary target: Each creature within the zone
Secondary attack: Constitution vs Fortitude
Hit: 1d6 + Constitution modifier necrotic damage

Hunger of Hadar. [PH:134]