Electric Dragons wield electricity with great prowess. Bright sparks race across these dragons’ bodies in a dazzling dance of light, complemented by the blindingly radiant sparks on their tails. Using their bellies and manes as stores for this electrical energy, Electric Dragons wield crackling magic, stunning and electrocuting their prey with a whip of their tail. During mating season it is typically those with the most brilliant sparks—an indicator of strength and hunting ability—that are drawn to each other.

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.

Semele has the same name of one of Zeus' lovers and has received the epithet "Ryuuraisei", which means "Dragon Thunder Star".

Loving to stand on high hills and looking down, she watches over the other dragons, who are in the same scroll like her. She has proclaimed herself as "the prefect", executing judgements and establishing rules, which are meant to keep the harmony and peace within the cave. However, she excludes herself from the rules, believing that she has more privileges than others.

If she sees injustice, then she does not mind to release an electric shocks on those who are responsible for the chaos.