Acheron is a mysterious island, near the coasts of MU, riddled with unique elemental monsters. NPC Deruvish, whom can be found camping in Acheron, came here with members of Vanert in search of Secromicon Fragments. The elemental monsters were far too strong, forcing Vanert to flee. However, Deruvish stayed behind on the island to help research the area and learn how to fight these elemental creatures. If you speak with him, he will offer you all the knowledge and guidance you will need to survive in Acheron!