This point of interest is the castle ruled by “The Ageless.”Epic Games Chapter 4: Season 1 Blog Post The Citadel was a Named Location in Fortnite: Battle Royale, that was added in Chapter 4: Season 1 to the island Asteria. The Citadel was a medieval castle and the main base of the Oathbound. Concept Art design for The Citadel is present on The Ageless and The Ageless Champion Loading Screens.
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The Citadel, Fortnite Wiki
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The Citadel, Fortnite Wiki
The Citadel, Fortnite Wiki