Fire and Ice

Chaos. Every member of the party not fighting was trying to put burning parts of their clothes out.   The elves tried to stay back, and pelt the bugs with arrows, but they proved a tough target, skittering about. Everyone else tried to get in stabs between bursts of flame. The beetles that were left alone, passed by the party and down side halls. But, those were few.
When it was over, all had been wounded and burnt. The hallway still smoldered, and was full of the twitching corpses of bugs. Gustav was found trapped under the coach.
"Baby Dragons, huh?", Gruffydd said as he tossed the burnt wreck of furniture aside. The party shot Gustav murderous looks.
Gustav said nothing but scurried into the small room the beetles had been trapped in.
Empty.
Gruffyd studied it. He then bent and began scrapping with his dagger on one of the stones near the base of the back wall. He pried it out. Then a stout wooden box.
It contained 500 electrum pieces!
The young cleric had a look that told everyone "I told you it was worth looking in here."
Burnt, bruised and bloodied they crawled to the level above. Rather than face the long rope climb to the surface, they were able to find the entrance Morey had discovered.
Outside, it was cold. It was dark. And the world was covered in snow.