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Thunder Fist, as the name implies, adds the Thunder element to Haschel's attacks. It can be bought in the Weapon shop of Ulara.
Sadly, since nothing is weak to Thunder, the attack has only aesthetic benefit and the drawback of doing less damage to Thunder enemies.
This should not be a problem in the next three areas, but on the Divine Tree and the Moon, if you don't want a handicap when going up against Cute Cats and Mad Skulls, bench Haschel until the Destroyer Mace is acquired.