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Nightsisters: Unlocking the past is a collection, that takes place within the Witches of Dathomir Theme Park on Dathomir.
You can start and complete this collection by completing the final quest, Repair the Altar of Power, in the crafter-related questline for the Nightsister faction given by Sage N'um.
Reward: XP and the Nightsisters Unlocking the Past Badge