The aforementioned left hand tossing. It's actually also the first ranged/melee hybrid at-will, at melee range instead of tossing left hands as projectiles the Warlock just whails on the target with the green left hand (faster attack rate + enemy damage debuff stacks).
Sometimes I think the spell names are purposefully misleading. Pillar of Power is actually a circle and its damage trap is actually a tentacle attack, and there's absolutely nothing involving stealing in Dreadtheft.
Seeing how Dreadtheft is actually Special Beam Cannon. Incidentally, one of the more interesting AoE roomsweeper spells in the game, though I do wish it had free-floating aim option as well as target tracking like it does now.
Warlock also gets the very first regular (albeit green) fireball.
Brood of Hadar is among the coolest looking single target Dailies, and dailies in general. Bat-spooge monsters could use a little work on their bodies tho.