Worms of Minauros is an encounter power available to Wizards at 7th level[AP]
Worms of Minauros
Wizard Attack 7
You drop a mass of writhing maggots onto your enemy. The horrors feast on its flesh, dissolving it with acidic drool.
Encounter ✦ acid, arcane, conjuration, implement
Target: One creature
Attack: Intelligence vs Fortitude
Hit: 2d8 _ Intelligence modifier acid damage. If the target ends its turn within 2 squares of the worms, it takes 10 acid damage.
Effect: You conjure a mass of worms in 1 square within the target's space. They last until the end of your next turn.