A supernatural space where mages who run afoul of Paradox are taken to learn a lesson or undergo punishment.
Some Mage fans think Paradox Realms are puzzles that must be solved without magick. Only then can the imprisoned mage escape. Multiple editions of Mage have stated there is no one way to run a Paradox Realm. Some allow magick, some don’t, some require it. Some present a puzzle that must be solved while others release the occupant when enough time has passed, some give a warning & others require an apology or demonstration that a lesson has been learned. STs have freedom to handle Paradox Realms as they see fit.
Paradox Realms may be in Deep Umbra. pg. 118 Book of Shadows
The Storytellers Vault contribution Never-Real Worlds by Allegra Van Rossum offers tables to generate Paradox Realms.