Deadbeard

Deadbeard (Talos in Japan, a reference to extremely strong enemies which shared that name in Camelot's Shining series) is the most powerful boss in the first Golden Sun game and is located in the lowest level of an optional dungeon called Crossbone Isle. This set the example that the second game followed: the most difficult boss in the game was optional and not the final boss. Deadbeard's counterpart in The Lost Age is Dullahan and resides in the Anemos Sanctum.