 Visil, who was actually the immortal lead researcher who created the Yggdrasil Project to restore the planet, merges with the core of Yggdrasil, becoming the Etreant in order to protect Yggdrasil.However, the player defeats him, destroying Yggdrasil.Drawing comparisons to titles such as "Wizardry" and "The Bard's Tale", "Etrian Odyssey" challenges players with exploring and mapping a vast dungeon.