Etrian Odyssey II leaves the town of Etria, travelling to the Grand Duchy of High Lagaard and their own Yggdrasil Labyrinth. A crisis within the dukedom has caused renewed interest in a mysterious floating castle, said to reside at the top of the Yggdrasil Tree. This floating castle has survived the drowning of the land by the oceans, filled with ancient technologies of times gone past. Adventurers are tasked to climb the dangerous maze to reach the castle and uncover its secrets, even at the cost of their own lives...