"Go check the veil. You know more about this kind of magics than I do, maybe you can divine something we can use." Lorent asks of Saphirrion "Don't go through unless you think it is at least mostly safe."
To the rest of the group "I agree, have Svetlana check the upper tunnel and we'll move to the falls at least to pass the critters.
There is not much back where we came unless we want to go through the prison again. But if this tunnel leaves to the surface outside and we cannot bypass whatever that veil is, we risk stirges without need. We're stronger now, together than we were when we infiltrated them and at least two of the cultists are down. But they will be ready for us. I still think we should try the veil, but if you're willing to go back through the prison, I won't object."