Spotted Greenwings are relatively small nocturnal dragons. Easily recognizable by the fleshy appendages growing off of their head and rump, they are most commonly seen in forests at night, leaping and soaring from tree to tree. While generally social, spotted greenwings are very quiet and rarely make any sort of vocalization. Their bodies are unusually warm to the touch, though they are unable to breathe fire. Greenwings are voracious feeders and will consume nearly any living thing that they can fit in their mouths.

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.

The aggressive eating habits of his species are the least of Teslin's problems. His clever little claws finger anything interesting that's not bolted down, thieving from others' hoards almost subconsciously. This kleptomania has lead many a dragon in the Dusk Divide Keep to persecute him, and whatever weight he gains from overeating is burned off when fleeing from them. Because of this, Teslin is distrustful of all other dragons, and prefers to be alone or with humans. His jittery, nervous personality doesn't help. For some reason, he is one of the Keeper's favorites, and she often brings him along on her travels.

He also has a crippling fear of heights greater than tree level, which doesn't come into play much as he's smart enough to stay below the canopy.