Arthur Conan Doyle message until now faded polaroid isaac Short life Complex Teacher's day
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Faded Polaroid - Binding of Isaac: Rebirth Wiki
The Binding of Isaac: Repentance |OT| One last run into the unknown depths below OT | Page 28 | ResetEra
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Apparently gulping the faded Polaroid makes it unable to open the door in depths which I guess makes sense since you can't put it in the door if you swallowed it :