Waterhorse Dragons received their name due to their horse-like physique and endearing behavior. They are capable of surviving out of water, and when on land their skin secretes a gelatinous goo to retain moisture. However, their large paddle feet are better suited for swimming, and waterhorse dragons tend to move very awkwardly when on land. Waterhorses are very friendly dragons and enjoy playing with humans.

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.

Lalit Nereus, his name meaning "playful water", is full of vitality every day. Lalit will swim around in a crystalline waterfall-pond between Plesioth's Beloved's bay and Idoya Desideria's bog, doing anything from dolphin dives to doggy-paddle. This keeps him fit, and prevents him from falling over as he leaves the water to play with the hatchlings. Hatchlings love to slide on his slippery back, or use his unsteadiness on land to tip him over. Lalit Nereus likes to play with his master, and will do nearly anything for a good bit of fun. However, Lalit plays an important role as well; he will huddle next to a feverish patient in Safi-dhaval's den to cool them down. He also makes a good shield when Shamira Kokoro is fighting off other invaders. His physique and 'second skin' of goo will protect any hatchlings or eggs in danger- but overall Lalit prefers to help out in non-combat ways, and, most importantly, have fun while helping.