The Empyrean Citadel excavation site is an excavation site found within the Empyrean Citadel. Players can reach it using the invitation box obtained from starting Missing, Presumed Death. It should be noted that it is a summoning-free area, and players will not be able to access their summoning familiars once they teleported there while having a familiar summoned (for example, having a Binding contract (waterfiend) summoned will not allow you to gain the 5% chance of duplicating materials while excavating).
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