As an Assist Trophy
Nightmare appears as an Assist Trophy. When summoned, he will first appear in his original Orb form before transforming into his true Wizard form, then blacks out the entirety of the screen, forcing players to fight in the dark.
While player tags disappear during the blackout, shields and other special effects do not, and players can use various moves to track themselves in the dark.
Nightmare is the final boss of Kirby's Adventure and its remake Kirby: Nightmare in Dream Land. Due to the threat he posed to Dream Land, King Dedede sealed away Nightmare by dismantling the Star Rod. Kirby, however, didn't know this was Dedede's intention, and reassembled the Star Rod in full by defeating Dedede's minions and ultimately defeating the king himself at the Fountain of Dreams. Once the Star Rod was placed back in the fountain, Nightmare was released. Dedede then Inhaled Kirby and fired him off to fight Nightmare.
Nightmare's design is based on Kirby: Nightmare in Dream Land, which in turn had borrowed Nightmare's visual redesign from the Kirby: Right Back at Ya! anime.
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