Castle - Room 48

You enter a grand space that looks like the apse of a cathedral. Resplendent stained glass windows emanate from an unknown source of light. Hooded monks pray in pews while a lone paladin kneels before an altar. Although he appears lost in his devotions, he addresses you:

Salutations. Be at peace in this sanctuary, once the private chapel of the king. Alas, he has gone mad and this castle has fallen to devilry. The interior twists its shape and rooms emerge that I have never seen. It's the wizard Salin's doing. Continue onwards to meet my brothers in arms. We serve the king still.