Horrid whispers
Wizard Attack 1
Area burst 1 within 10 squares
Target: Each enemy in the burst
Attack: Intelligence vs. Will
Hit: 1d6 + Intelligence modifier psychic damage, and the target is slowed and takes -2 penalty to attack rolls (save ends both).
Aftereffect: You knock the target prone.
Miss: The target is slowed and takes a -2 penalty to attack rolls until the end of your next turn.
Horrid Whispers is a 1st level daily Wizard attack power. [AP:102]
It is considered an excellent choice, as a friendly area attack that slows, knocks prone, and has a condition on a miss.