Stone of Passage
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This item is dropped from monsters in temporal incursions. It can be used to open closed doors (as indicated by the red icon) in the temporal incursion.
There will always be at least one Stone of Passage contained within rooms that have at least one closed door [citation needed], and it's possible for more than one Stone of Passage to drop when there are multiple closed doors.
Like other Incursion items it can not be taken outside of the temple and will be dropped on the floor upon leaving.