The hole in the ceiling had rough-cut rock sides. It didn't look like it was originally part of the catacombs' design, but it also was a lot older than the goblins work. Getting a rope up there would be very tricky, but maybe not completely impossible.
Meanwhile, with the full concentration of the arcane members of the party, the shield finally collapses and Zerriksa stumbles out. "About time," she mutters. "Thank you all the same. What's the plan now?"
As the party considers this, they take the time to look more fully around this antechamber. Despite some drake damage and goblin graffiti, the murals and tombs remain mostly intact. One alcove looks to have recently been the resting place of a drake - and the lid is cracked open. Derath feels drawn to it, and wandering over discovers the body of some long-dead cleric or paladin. It is readily apparent merely by the feel that this was a holy man. Miraculously, the chainmail he wears and the rod clasped in his skeletal hands remain as bright and clean as the day they were forged.