When I did garden of salvation the sol divisive we’re communing with the witness to empower with darkness. So, how come they’re the only vex to worship it despite the other vex factions aren’t light or darkness?
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They went a bit further into it last season, but the main reason is that they believed it was the only path to surviving to the end of the universe by allying with a paracausal power. The main objective of Vex is to simulate enough realities to determine how to survive until they are the last race alive, but the Sol Divisive decided to join the Witness rather than fight them. Other Vex factions tend to give them a wide berth like seeing a crazy person on the street instead of interacting with them.