A dark pit 3" in diameter opens within 24" of the caster - use any round magic template to represent the pit. All models beneath the area covered by the pit must roll under their Strength on 1D6 in order to climb out. Otherwise they fall into the pit and are entombed in the earth as the pit closes over them. As no wounds are inflicted no armour saves apply, and magic items which save or negate wounds are ineffective.