This is why we cant have nice things.

She was a well-attentive servant, digging when he told her to. The ground swallowed them whole but he had been bracing for it, there had to be entrances all over the place. Some creature must be making these strange tunnels. He kept himself upright all the way down into the cavern, sliding along as if surfing a wave. He arrived behind the girl. She made as if to lead him but he grabbed her first and held her against his side.

"Notice the walls." He rumbled with a hint of curiosity and pushed her towards them, "Mark what you find in your book." He ordered. He had grown a touch coarse of late. Her scent drove him mad, their trails proving fruitless, and now this crazed tunnel of unknown origin. He placed his paw over the wall and felt it gritty like sandstone. The light from their entry bounced off tiny glittering fragments. What could help guide them through these darkened tunnels?