The 40lb Sledgehammer is so heavy that only the strongest are able to wield it, and even then it's nigh on impossible to make a clean strike. But if you do manage to connect with your opponent, a single blow is often enough to pulverise their bones into dust.
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The Sledgehammer has a unique bonus named Smash. Smash is a passive bonus that doubles the damage dealt by the Sledgehammer. However after using the Sledgehammer, it must be "reloaded", similar to reloading a primary or secondary weapon.