Thunder Dragons are the masters of electricity. Their wings gather energy as they soar through the clouds, and when they clap their wings together they can create devastating arcs of lightning. They can stay airborne nearly indefinitely, landing only to sleep and breed; they catch their prey from the air and take moisture from the clouds. A thunder dragon’s roar is considered to be an omen of misfortune.

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.

Tharanu is the youngest and most impetuous member of this Cave's trio. He enjoys spending time on his own, rejoining the trio once each fortnight to add his magic to their call. Standing with the others, he brings the air around him to life with cracks of energy, channeling the power of the sky through his magic. On other nights, he can be found diving through storm clouds, reveling in the feeling of the lightning coursing through his wings. Only his eyes are visible amidst the dark haze, appearing as twin sparks like tiny stars racing from cloud to cloud. Behind him, he leaves a trail of lightning and destruction, and a roar lost in the echoing sound of thunder.