A bunch of trolls mining

Looking through the entryway, you see a vast and dark chamber. So big that the lighting hitting the walls doesn't completely illuminate the whole thing.

How big even is this cave system?

You creep into the chamber slowly, and see that you're on a ledge. Peering over reveals the source of the light and noise.

A score of burly trolls, squat and grey-skinned, are striking the walls with picks by the glow of their torches a couple of floors down.

That could be bad news. Trolls themselves were crude fighters and hunters, but only ever built things or organized in large groups when one or more of their number developed Fey Magic. Those were the true threat and a source of fear to those out in the countryside, putting curses on farmsteads for no reason than to cause hardship and stealing human infants to raise as **** workers and soldiers in the fairy forts.

You observe the miners for a little while longer, then start walking along the ledge, beaconing Una to your side. You're able to find a path cut into the wall of the chamber and go down it. About halfway down you find a hole in the wall that opens out into a series of small rooms. They're a dead end though. If you're going to keep going, you'll have to go down to where the trolls are operating eventually.

You sigh, and address Una, "Let's take a good rest here before we risk any more excitement today." You'd at least like the whole of your magical energy when you're going be moving among those trolls.

Una nods and helps lay out your bedroll. You undress and lie down in it, wrapping your arms around Una when she presses up to your side, nude as well.

The clang of metal on stone rings out still, but you manage to tune it out as you fall to sleep.