Seriously, the DC to climb a rope while braced against a wall is<em>5</em>.  Given that half the group is part Ranger or Rogue, I'm sure we've got a few people who can manage the natural DC for the rest of us.<br/><br/>We can even climb all Stealthy-like, which might not be available to us since it's easy to build a Switchback without visual cover (given the fortress-like construction in the image, I assume the ruins were originally build to handle a siege and so that applies).