A granite cave.
A mostly natural cave with dark granite walls. You notice some marks on the
walls from search for more valuable minerals, but they are very old and it's
impossible to tell who made them. Could be gnomes, dwarves, orcs or whoever.
The timber that were supposed to hold the vast weight of the mountain above
are not that supportive anymore and seem to splinter away when touched. The
ceiling is very low at some points and you need to crawl through the veins,
but sometimes it's impressively high and you can't see the ceiling.
Stalagmites hands from the ceiling and most of the stalagites have eroded
away. The tunnels twist themself into the darkness and they are irregular in
shape and size, but not totally unlogical. All tunnels seems to be on the same
ground level. Deep green slimy moss covers the granite walls in some places.
White fungi grows on the ground,  but also on the walls here and there.
There's no signs that the cave is inhabitated by any normal creatures.
This room is round and the ceiling is very high. The room is vast and all the
walls are covered with gems in different colors. Hovering magical light
sources light up the place and make the gems sparkle.
Obvious exit is: east.

a gigantic black stone monolith, pulsing with divine powers
New room discovered -- you feel more experienced.
You gain 32774 additional explore experience from finding this place!

hp: 1453(1453) sp: 455(508) ep: 243(459) exp: 154157 [+36497]