Now that I think about it, even if we do go with this plan, maybe Shuushar should be w/Surana & Eldeth w/ Erevan. I figured we didn't need him up front to "guide" anymore since there's just the one trail, but...we're directly outside his home now. He may be able to offer insight and warnings on known dangerous parts of the trail.
And Uller, if there's enough natural light for Bert and I to function normally, I'll ask Orsik to dismiss the Light spell on the torch to avoid drawing attention.
No, there isn't really enough light to function normally. In the distance you can make out pockets of light...it's like the underdark version of coming in for landing at a small rural airport on a dark night. You can see lights below and "stars" above but they ain't illuminating you.
How long is the length of rope between each character?
I'll have to think about it. I'm thinking athletic checks to avoid falling will be with advantage if you are tied to someone. But if you fall then that character must make an athletics check to also avoid falling. It's not going to be crazy high...Probably 10. If the character that fell is smaller than the one holding them up it will be with advantage and disadvantage if they are larger.
Falling won't be as catastrophic as in the chasm. It's more of a rocky slope than a free fall into the void so if you both fall you'll likely catch on something. It'll hurt but I wouldn't expect it to be fatal unless you are really unlucky (or already hurt).