Building 3-32: The Arena of Illusions.

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Illusion - Real

Golden Armor - Decaying Armor
Servant Zombie - Burning Zombie
Bunny Skeleton - Ape Skeleton
Peeping Eye - Winged Eye
Knight Zombie - Lizard Knight
Gentleman Zombie - Hyde
Golden Worm - Vulture Worm
Polter Chandelier - Polter Chandelier
Polter Portrait - Polter 2x4
Zapf Bat - Creature Bat

Saint Legion - Corpse Legion

Must defeat both legion forms in order to open up both dimensions.

Jekyll and Hyde
Gemini Skeletons
Gemini Zombies
Two-Side
etc.