After laying to rest the Nightmare of Arguth, the Tormented, Eris detected a psychic cry that called out to the Pyramid. She believes Calus has used the Hive's ritual and the relics unearthed here to restore a connection to the Pyramid after your successes severing his connections aboard the Leviathan.

Eris now directs you to make your way to the Pyramid to further the investigation.