Nebul: "Well, ... I promise you I will seriously consider your offer. That are some interesting concepts you propose." Scientific ambition reawakened, he dives into theoretical discussion. "But don't you forget about Kalvin's Law of equal Energy: 'Energy can never be created or destroyed, only transformed from one form into another.' To achieve a specific mechanic affect of given Energy you need at least the same amount of magical essence. And I just don't have the essence to power my prosthetic for longer than a few minute. Even with optimal efficiency I could stretch that by only one, maybe two minutes." He looks over to a big clock on the wall. "It really is getting late. And I have much to think about." He pulls a rope that is hanging from the ceiling. His strange moving seat hops a few feet forward, then stops.
"Darvit!", he curses (an old dwarven curse that has no translation). "Why does the stupid thing do that to me now?! ... Nebul, could you do me a favor? In the next room there is a to set of counterweights. All you have to do to pull them up is to turn the crank."
IF you do as he asks: In the next room you find a chaotic construction of axles, pulleys, ropes and chains, going through holes in the walls and ceiling. A enormous block of stone hangs in the middle of the room, nearly touching the ground, a relatively small crank near it. Turning the handle should lift the block, but you soon realize that this will be an exhausting task. Not because the handle is hard to move but because you have to turn it several times to lift the weight just by the width of your small finger.
Kurgen: You don't have much time to examine the bodies, but enough to learn this: The wounds are severe, armor shredded, limbs ripped off and without doubt deadly. But a fast spell tells you that these are not the only ones. The victim suffered from a sore tooth, a long but thin scratch along the neck and two small but deep holes in the back, probably from a dagger or an arrow.
You decide to talk to Thorin privately as soon as possible. But you reach out he deserted outpost before an opportunity arises.
The rooms here are stuffed with supplies of all kinds. Mostly what you would expect: lamps and oil, food, armor and weapons of all kinds, ammunition, kegs with the markings of the mechanics' guild, ropes, tools and much more. A bunch of medallions hang from a peg at the wall.
Thorin answers your question: "Long enough? What are you talking about? I don't know what's going on at the surface. And I don't care. I have enough trouble on my own down here, now that the ... Oh ehm, never mind. Let's get ready to move!"
Just when you tell him of your disturbing findings you notice the faint smell of blood. It comes from a table near the left wall. On it: two thick purses, one spilling it's contents, a few piles of coins, pen, paper and a candle, some medallions, a small treasure chest. Next to the table a small pile of empty purses lies on the floor, some stained with blood.
I will try to make Nebul's part as interesting as possible while we wait for the events to move on on Kurgen's end.
Alternatively we could blend in a little flashback of how he first met his mentor and one of the first lessons.