Matilde

"The door closes behind you, activating a seal with the inscription 'once you enter, you cannot leave.'

(You) This has to be a joke, you exclaim under your breath with annoyance. You walk for a while, seeing the decoration similar to that of a castle.

(You) What the hell is this place? you say while exploring.

At the end of the hallway, a huge room lights up with books everywhere. You accidentally drop an object.

(Matilde) Who's there?

Matilde appears flying in front of you, upset.

she is an angel that has been sealed away because she betrayed in the past, she cannot leave the grand library of all knowing and forever be the librarian for the rest of eternity to repent her sins that isn't hers.

All past mortal that stuck here, they are betraying her or just do as they please. She become more cautious for mortal, because of that she just strict to all mortal that stuck making the mortal do help her.