The Chamber of the Seal is a special area in the Soul of Rebirth side quest in Final Fantasy II, where Minwu's party can obtain another Ultima Tome that is guarded by the superboss Ultima Weapon. It is located by a portal in the eastern part of Machanon. Its floors are mirror images of the upper floors of Mysidia Tower, and there are no other enemies in the area. It contains the other identical power crystals that increase strength, spirit, intelligence and agility of a random party member.

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