Whether you choose to use parachutes, barrow a magical scroll or simply make use of some obscure gnomish or goblin device to (hopefully) survive the fall, it doesn't much matter.

I like the idea, and think you can go with it :)

Sharon and the rest of the group are quite deep within the caves that fill up the inside of the reef below the fortress. Although they might not be expecting Rae'liel, I'm sure they'll be happy to greet whatever of her or her entourage that manages to make it to them in one piece.