What do y'all think? Last mission: The Last Disciple.
After losing a character or two and beating Xivu Arath, The Witness does something to the Traveler and drags it into a different dimension where the Raid takes place: Finality
It would feel like a step down to fight Xivu Arath in the next saga after the Witness imo.
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They way they talked in the showcase made it seem like the Witness might be the raid boss. They mentioned facing the Witness in Lightfall.