Four's Fortress is a location in the Land of Mountains. It is a citadel defended by the Garrison and Cliffside Path.

Five travels to the this location in search of the seas treasure. She finds a Giant Crab off the coast of the citadel and, with Gabriella, kills and eats it. Three also comes to the citadel with Gabriella in order to kill her old experiment Cerberi.

Zero arrives at the citadel in search of Four. She and Mikhail kill every soldier in the fortress only to find Four is not there.

In Branch D, Zero finds Four at the citadel, completely under the flower's control. Four summons her dragon, Zophiel, to fight her sister. Her dragon falls, leaving her to fight off Zero herself. Zero ultimately kills her and has Mikhail devour her corpse.

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