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The Battle Tower on Sentinel Island was once ruled by the great magician, Maxos before he disappeared. A few hundred years after Maxos disappeared, the evil necromancer, Laiken broke the magical wards on it and took it over. It was used for his evil experiments into the undead until the Dragon Knight slew every evil creature inside and took it over. It is now used to further his/her quest.
IMPORTANT! Any quests that you have in Broken Valley will be failed when you kill Laiken and take control of the Battle Tower.