There is no quest for the bastion. And when passing the corridors of time and after their disappearance, there was no quest for the bastion.
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Hey there! You have to finish three quests before you can get the Bastion Quest: - "Recovering the past" - "An Impossible task" - "Completing an Impossible task" This should grant you the seasonal Triumph "Saintly Savior". Once you redeem it, you should be able to get the Quest from Saint-14.
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Please do not add unneeded things like polls to your questions. Thanks. Please provide a screenshot of your interaction with Osiris and with Saint-14. It would also help to see your quest page.