But you can just as easily open the door using one of the books nearby.
Regarding the "room with the 4 baddies": you don't even need the key, since you are able to teleport/ jump and even cast (no projectile spells) through that door.
Good tip, I'll keep that in mind in my next run, when patch 2.0.1 (after they fixed everything that needs fixing) comes out.
