Nocturne Dragons are a strange breed. Whenever light strikes their bodies, they are frozen in whatever position they were in. This leaves them vulnerable and they rely on camouflage to keep themselves safe. They are often mistaken for statues when in this frozen state, but Nocturne dragons do not actually turn into stone. Rather, they merely idle until the sun goes down. At night, these dragons come to life, proving themselves to be powerful fliers, although little else is known about their true behavior.

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.

Purnima, meaning "the night or day of the full moon" in Sanskrit, has received the epithet "Ryuusekkusei" or "Dragon Stone Star", because she is often mistaken as a stone statue during the day.

It is said that she takes a seat besides the entrance to the cave, in which the dragons of her scroll live, during the day to scare away their home from outside dragons and to protect the defenceless dragons who remains there during the day. However, once the sun is down, she suddenly roars to the sky and flies away.

She is a mysterious dragon and no one is really able to make a picture of her. It is said that she has a beauty glimmer when you look at her and the moon light is bathing her.