Glitterdust is a daily power available to Wizards at 5th level[AP]
Glitterdust
Wizard Attack 5
You call forth a flash of brilliant light that leaves golden dust on all nearby creatures. The dust sparkles with a supernatural luster
Daily ✦ daily arcane, implement, radiant
Area burst 1 withing 20 squares
Target: Each Creature in burst
Attack: Intelligence vs. Reflex
Hit: 1d10+Intelligence modifier radiant damage, and the target is blinded until the end of your next turn
Effect: The target gains no benefit from concealment or invisibility, nor can it become hidden (save ends).