Ultimate and grandmaster liminality is bugged when you get to the room where u have to go left and right and grab the orbs to deposit into the ahamkara skulls. Right side room doesn't open to let you escape.
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At higher difficulties the exit path through the ceiling remains closed until you fully destroy the multiple waves of Taken Eyes that spawn in; this same mechanic is present in the right-hand tunnel during the boss encounter. (΄◉◞౪◟◉`)
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Right side room's exit is through the ceiling, not the door you came through.
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Did you stand on the totem in the middle of the room beforehand ?