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Phantasmal Assault
wizard attack 1

Target: one creature

Attack: Intelligence vs. Will

Hit: 1d8 + Intelligence modifier psychic damage, and the target grants combat advantage and can't make opportunity attacks until the end of the next turn.
Increase damage to 2d8 + Intelligence modifier at 21st level.

Phantasmal Assault is an at-will power available to wizards at 1st level.

A fearsome ogre appears, threatening your foe with a massive club. Or perhaps a snarling drake, or maybe a troll.