FitzTheRuke
Legend
The rope is looped through each of the arrow-slits and hanging against the wall. It's still pretty tricky, so I'll say an Athletics or Acrobatics of dc10. Rodrigo's help will give you Advantage, and you'll only fall if you get 5 or lower. If you make over a 20 (unlikely, of course) it won't count as difficult terrain.
(Let's let the dice decide!)
(Let's let the dice decide!)