The Bat Outta Hell is a melee weapon for all classes except for the Engineer and Spy. It is a skull with a jiggleboned lower jaw attached to a spine segment. The weapon includes 4 styles.
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Universal, just the skull and spine segment
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Scout, adds the scout's patrol hat to the skull
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Soldier, adds the soldier's helmet to the skull
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Demoman, adds the demoman's beanie to the skull.