FYI...there is a wasp nest in the flake at the beginning of the climb. It's about 2/3 of the way up the flake (where you can get a nice red alien). I avoided getting stung by a very narrow margin (I was getting dive bombed). Regrettably, my follower got stung removing the alien.
Haven't done Arch in ages and ages; I forgot how much fun it is for a 5.4.