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Phantom cage
wizard attack 1

Your enemy shrieks in terror, desperately trying to avoid the cage of razor-sharp blades that it sees closing in around it.

Target: one creature

Attack: Intelligence vs. Will

Hit: 1d8 + Intelligence modifier psychic damage. If the target moves before the end of the user's next turn, it takes 5 psychic damage.
Level 21: 2d8 + Intelligence modifier psychic damage.

Phantom cage is a 1st-level wizard at-will attack power.

By crafting an illusion that completely surrounds your foe, you give it no opportunity to escape. In its mind, the enemy sees itself hemmed in by a spinning mass of deadly blades, perceiving grievous wounds that your magic translates to pure pain.[HotFL:205]