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A Nexus is a machine created by the D'ni that holds and organizes many linking books. It is activated with a KI, which can be used to choose a specific linking book from its stores which is then retrieved and placed open for the user to link with.

The Nexus acts as a central hub for Explorers, allowing them to link to any book they've found in Ae'Gura. After receiving an invite from another explorer, it can also be used to link to their location.