*Further delving into the akashic memory reveals that the Twilight Chamber has always been the home of these terrible creatures, both the vrex swarm and the hideous bat-creatures, the cloakers. The cloakers lord over the chamber, killing the curious that come into it, attacking their lights. The chamber is said to be haunted by all those that have died in it, and more than one death can not be laid at the cloakers' feet, such as they are.*
*Because you were following the yellow veins of rock, and the next color to follow is green, it might be a bit difficult to find the right passage to take. However, judging from the direction the greyfolk were taking, you narrow it down to about three. One of them provides complete cover from the chamber through a bend in the rock, enough so that you can raise your lights again.*
*You all breathe a sigh of relief as you see the green rock walls around you, and settle down to rest. Behind you, you can hear the very faint scrabbling of the remaining vrex (mouth-rats), and the occasional haunted moan. The place seems oddly cold.*