Tharn's Great Hammer

Summon a spectral great hammer and slam it into the ground sending a shockwave damaging objects and creatures around you. Creatures must make a CON saving throw. On a failed save the creature takes 8d6 bludgeoning damage or half on a successful one.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.