Skull Trap

School: Necromancy
Range: 20 yards
Components: V, S
Duration: Until triggered
Casting Time: 3
Area of Effect: 30-foot radius
Saving Throw: None

Upon casting this spell, a skull is thrown by the caster at the target area. The skull floats in the area until a creature comes within 20 feet of it. When this happens, the skull is triggered and explodes, damaging everyone with a 30-foot radius. The damage inflicted is equal to 1-6 hit points per level of the caster. When casting this spell, it is wise to set it far away from the party, lest they set it off accidently.