Is this the path you've chose?Edward to Kain
Edward appears as a boss in Final Fantasy IV: The After Years. The battle is fought at Damcyan's Castle in Kain's Tale, when Kain's dark side tries to steal their Crystal in exchange of a chance to kill Cecil Harvey. Rosa accompanied Edward in the battle but she cannot be hurt and the player can only win by defeating Edward. He can attack Kain but the damage is very low, two Jump attacks should be enough to end the battle.