From the PHB:

Roll a d20. If the roll is 10 or higher, you succeed. Otherwise, you fail. A success or failure has no effect by itself. On your third success, you become stable (see below). On your third failure, you die. The successes and failures don't need to be consecutive; keep track of both until you collect three of a kind. The number of both is reset to zero when you regain any hit points or become stable.

 Cool.  So in that case he can at least survive 2 failed death saves from jumping.  Narstin would be more willing to jump if needed in that case, but would still prefer lowering by rope unless a good argument is made why they don't have the time.

If time permits, then Tozer is willing as well. All bets are off if spiders or drow return. 

I was prepared to add this to my last post in the official thread:

Using the ropes procured by Narstin and Beegred (if he's willing), Tozer ties a loop at the end of each rope. He places one loop around Derendil's chest (under his arms) and the other loop around the quaggoth's legs. The two dwarves, each with a rope in hand, then lower Derendil to the water below...

But realized no arrangements have been made for untying Derendil, or Ferriman for that matter. 

Xilyrah is already in the water, so will hopefully drag Derendil to the shore, and untie the ropes... If that is too much work for one, then Beegred can slide down the rope to help.

(Beegred will help, as long as he gets his rope back after the rescue is done.)

Did you forget Ferriman or are you deciding to leave him behind?

Totally forgot he was still there.  I"ll go back and edit to let him down too

Well, Quasimodal has noted he's untying the rope and then jumping.  I was only playing it out to see if you'd leave the rope behind or not.  Now that has been resolved, you will all reconvene on dry land, next to the water.

Gotcha

You're all together down below at the shore, on dry land.  It is dark, the water fall drowns out any hope of hearing anything from a distance and there are faint lights to the north, west and south.

What are your priorities now?  What do you want to do or accomplish?

Buppido mentioned a place called Gracklstugh, but I don't think Xilyrah was present for that conversation. Are we still controlling our NPCs or are we considered out of combat?

Out of combat.  That's a discussion I need to narrate, but I want to know what your priorities are? You all just want to leave as soon as possible? 

I suppose the only reason to linger is to wait for Ferriman and Derendil to awake. I don't suppose the drow are letting us go without a chase, however.

Given that it’s 1 and 4 hours for them to wake, definitely can’t wait right now. We’re basically right under the cell, no way they don’t come after us quickly.   I’d say move for now, and watch for somewhere we can hide to rest

From the description in post 607, Blingdenstone to Gauntlgrym (surface dwarf city) sounds the best. But it is only a mild preference. I'm willing to go with a different choice.

Fortunately, Narstin can cast Light. Otherwise, we would be forced to go with Sarith, as the only other person who can generate (dim) light.

Seeking DM-granted inspiration for Tozer for post #608.

• Flaw: I am slow to trust members of other races, tribes, and societies.

Quote from Jack_Joke >>

Seeking DM-granted inspiration for Tozer for post #608.

• Flaw: I am slow to trust members of other races, tribes, and societies.

 Granted!

Quote from Quasimodal >>

From the description in post 607, Blingdenstone to Gauntlgrym (surface dwarf city) sounds the best. But it is only a mild preference. I'm willing to go with a different choice.

Fortunately, Narstin can cast Light. Otherwise, we would be forced to go with Sarith, as the only other person who can generate (dim) light.

 Only if I get a holy symbol as a spellcasting focus or some phosphorous moss or a firefly to use as a component.  I actually posted yesterday to cast light when someone said for sarith to do dancing lights, then deleted the post right after when I remembered it required a component.

Then acquiring a bit of phosphorescent moss for Narstin should be our priority, as soon as we move out of that cavern. I would think there is plenty of it around the Underdark. Otherwise, Sarith has the group over a barrel, as far as where to go.

Sarith shakes his head 'no' at this, "The direct route to Blingdenstone, Gracklstugh, Neverlight Grove and Sloobludop all pass through the Darklake, but unless you can breathe underwater, swimming is an impossibility and there will be no boats just lying about.  Even with boats, if we are assaulted by the creatures of the darklake and fall out of our boats, it will surely mean certain death by drowning.  I am going to Neverlight Grove with Stool.

I'm confused by this paragraph. First Sarith says Neverlight Grove requires passage through the Darklake (which doesn't sound promising), but then still says he's going to Neverlight Grove. Am I missing something?