Cavern Lurker Dragons are nocturnal ambush predators. Although small, they are very aggressive and will attack anything weak enough to be overpowered. Their preferred method of hunting is to lie in wait in a cave, burrow, or other small, enclosed space; when any potential prey passes they will lunge out to grab hold of the unsuspecting victim and drag it back into the lair. Cavern Lurkers have an odd aversion to sunlight and almost never venture out during the day. More commonly sighted are the odd piles of bones they stack near the entrance to their dens. Their mating call is a low-pitched bumping noise.

Dragons are highly-intelligent reptilian creatures that—from a human perspective, at least—appear to live forever. Many different varieties of dragon exist, each with their own unique qualities, habitats, and behavior. Adolescence in dragons is usually marked by the growth of a hatchling’s wings, although not all breeds of dragons grow wings and some breeds have other traits that indicate the beginning of maturation. In Galsreim, dragons and humans coexist peacefully.

Obsidian Glass is a very orderly dragon. He regularly clears his den of dirt and debris, and makes sure the bone pile in front is neatly stacked. If everything is not to his standards he becomes very ill-tempered, even by his breed's standards. His mate is Lit Cavern the silver dragon. He spends lots of time cleaning her scales and mane, which she enjoys greatly.

When his den is exactly the way he likes it, he enjoys taking small walks to enjoy the moonlight. He also likes the feel of water, but cannot swim. He has tried fishing on multiple occasions, but has yet to actually catch anything. So he usually sticks to his breed's regular hunting patterns.