From the Super Mario Wiki
King Bomb is a giant Bob-omb that is summoned by the Magikoopa in the Super Nintendo Entertainment System game Super Mario RPG: Legend of the Seven Stars. It uses Big Bang and Mario's Fire and Jump attacks are King Bomb's weaknesses. A King Bomb is also used by Punchinello in a last-ditch effort to destroy Mario, Mallow, and Geno, but it only ends up crushing him and not even hurting Mario's party.
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