The Claykken's Sea of Fire is the twenty-fourth stage in Kirby and the Rainbow Curse. It is the fourth stage of Red Volcano and the sixth boss stage of the game. It succeeds Volcanic Panic and precedes Infiltrate the Junk Factory!.
Kirby rolls through a burning area to reach the boss. The Claykken now sports an eye patch and a magenta and blue color scheme. His attacks are mostly unchanged from The Claykken's Lair: He reaches his spiky tentacles into the arena, launches himself at the pink puff like a torpedo, and releases ink clouds. His vulnerable spots—the smooth areas of his tentacles and the welt that forms when he crashes into the arena—also remain the same. Unlike the first battle, however, this duel takes place above lava. The Claykken often breaks bits of the platform when he attacks, and if Kirby falls into this lava, he is instantly KO'd.