The closet in which you find the dodecahedron is locked. My character is not strong enough to bash the lock. Annah is not good enough to pick the lock. I can't progress at all.

Is there some way to get this thing open? God knows why the devs made it a locked door, it seems like a decision made solely to frustrate players who did not pick a particular character path.

Spoilers ahead of course. It's possible to open the closet. Once you meet Ravel you find out some people you had met before were actually part of her essence..or something like that. Anyway. After the maze you can go talk with Mebbeth, then with Kesai-Serris who will offer to accompany you to the dream machine. In the dreams you'll find the information on how to open the closet.