Etrian Mystery Dungeon 2 (Seikaiju to Fushigi no Danjon 2; lit Yggdrasill Mystery Dungeon 2) is a spin-off of the Etrian Odyssey series and a sequel to Etrian Mystery Dungeon. Like its predecessor, it is a crossover with Spike Chunsoft's Mystery Dungeon series. (etrian.wikia.com)