In Kingdom Hearts III, Boom Hammer is the first Formchange of the Classic Tone Keyblade, associated with Guardian Form. Its attacks are nearly identical to those of Hyper Hammer, with the only difference being that Boom Hammer's slams leave gears and cogs in their wake instead of cracks. Its ground combo has Sora leap forward and slam the hammer into the ground in front of himself, spin it around himself, slam it in front of and behind himself, slide it forward before swinging it upwards, and finishing by enlarging the hammer and slamming it on the ground. The air combo is identical to the ground combo, though the slams are replaced by Sora spinning the hammer vertically.
Boom Hammer uses Proximity-style Magic.
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Learning Boom Hammer
Kingdom Hearts III