Dark Star Core

Dark Star Core is the fusion of the Dark Star and Fawful, and serves as the final boss for Mario and Luigi. It consists of Dark Fawful's remains and the Dark Star. Mario and Luigi must destroy Fawful so they can defeat Dark Star once and for all. After a few turns, Dart Star will resurrect Fawful and leaves Bowser's stomach, forcing him to spit the Dark Star Core into Dark Bowser, meaning the player must do the phase all over again.