SRD:Mattock of the Titans
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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.