I'm wondering a few things about the doomsday locks in Windsong Abbey, which may come into play if my PCs decide to actually go in through the stained-glass window in area C3.
What do the doors that have a doomsday lock look like from the other side? For example, say the PCs go in at C3 and upwards from there. Sooner or later they will get to area A10. Does that door work the same from the inside? Or is there a difference?
And how exactly do you open the other doors? Most of them are described as "having a doomsday lock like the door in A10, but without the trap" - so, do they all need a six-part combination, too, and if so, is it the same combination for all the locks?
I just noticed that the text accompanying the poem that encodes the combination for the lock in A10 refers to all the doors, so that answers the second question.
But still, how do these doors/locks open from the other side?