You would have made your way down into a deep crevice, lots of climbing and squeezing. You must have brought along a guide familiar with deep delves into the Darklands. You might have had to dodge duergar hunting parties, making your way through Nar-Voth and deeper into Sekamina. Here you found a massive chamber with an unbearably bright light glowing from a crack in the ceiling, creating an underground forest. You saw a monumental statue of a dwarf carved into a distant wall, but before you could make your way to it, you were set upon by elves. Not dark elves, but elves not quite like those from the surface either.
Fighting a retreat against them and massive lizards, you made your way into a the relative safety of a cave opening almost directly across from the statue. (This cavern is miles and miles across). From there, there was screeching and a sudden fog came over your mind.