SRD:Mattock of the Titans

Mattock of the Titans: This digging tool is 10 feet long. Any creature of at least Huge size can use it to loosen or tumble earth or earthen ramparts (a 10-foot cube every 10 minutes). It also smashes rock (a 10-foot cube per hour). If used as a weapon, it is the equivalent of a Gargantuan +3 adamantine warhammer, dealing 4d6 points of base damage.

Strong transmutation; CL 16th; Craft Wondrous Item, Craft Magic Arms and Armor, move earth; Price 23,348 gp; Cost 13,348 gp + 800 XP; Weight 120 lb.