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Hammer is a boss in Xenogears, fought at the end of the second Anima Dungeon.

Now physically fused with a powerful Gear by Karellen, Hammer has the ability to morph and grow arms, legs, and a spiked tail, granting him extra attacks per turn, as well as a gel breath attack.

Hammer also has a self-destruct mechanism that he attempts to use before his death at the hands of Fei's party. If the party destroys him before he can self-destruct, the player is rewarded with an unique item called the Trader Card, which greatly increases the player's chance of receiving a rare item drop by a 100% from defeated enemies when equipped.  

References[]

Perfect Works, pg79. (Gear spec conversion table)