Inside the Cathedral
Anders has been escorting Prad who has been rather passive until now, but he's not taking any chances.
If the Black Pearl is in Prad's possession, it seems to have led him here... for some reason. He's leery that it may suddenly prompt him to run off, especially through one of those doorways! If that happens, it might change and lead to somewhere else!
"Someone tap the glass with a hard item... just lightly... to see if it really is glass," he suggests. "I've heard of sorcery that can turn metal transparent, but also sorcery that can turn glass as hard as steel."
"Don't know if either of those things is true, but it seems like something sorcery would be capable of."
He'd seen a few grander foyers, but nothing quite as spectacular... or strange... as this one made of green glass.
Does the ceiling here in the foyer appear to be high enough to match the external dimensions they observed on the outside? Same for the walls. Is the foyer the full width of the building?