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Dimentio trapping Luigi with himself.
Castle Bleck Interior is the main location of Castle Bleck during Super Paper Mario. Castle Bleck Interior is full of puzzles and mirrors and is full of Dimentio illusions. Theres also many X Blocks and Luigi needs to hit a few of them. Mario and Luigi then need to chase Dimentio through the various chapters in the game and then Luigi must battle Dimentio. But Dimentio creates a block around Luigi and himself-and commits suicide as well as killing Luigi. Mario continues to Castle Bleck Inner Sanctum.