Magma Bowser

Molten Bowser is a form Bowser takes as Hammer Slam Bowser in Skylanders: SuperChargers. In this form, Bowser's melee attacks are augmented by fire, allowing him to unleash fiery claw swipes, his signature Fire Breath, and summon flaming Dry Bones.

Giga Bowser was briefly considered as a transformation for Bowser for his Skylanders: SuperChargers appearances instead, but was ultimately declined in favor of Molten Bowser.