The Magister's Key is an item in Divinity: Original Sin 2
A fine key, bright as a new penny, marked with the emblem of the Magisters.
- Magister Yarrow gives you this key if you keep Migo alive in the quest "The Murderous Gheist" (requires Yarrow Flower).
- Alternatively, you can kill Magister Yarrow for the key.
- Carson, the Snickering One in the Arena of the One gives you this key if you let him have a Companion Origin Moment with Beast. Carson claims he stole the key from Kraus.
- This key opens a room on the upper level of the fort. You need to get teleportation gloves from the crocodiles to go up there.