Black Dragons are warriors. They are strong and capable in battles of force, but also ample magic users, capable of devastating opponents with their spells. Their bright eyes give them excellent night vision, which is why they generally hunt during the night.

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.

Kero is a Member of "Team Pentragon".

His Element is Dark.

He is known as the Dragon of Darkness. He likes his powers, and also acts a little bit demonic. He loves to tempt others and he is also a little bit impudent. But for the ones who like him, he would give all of his life.

During the day he sleeps in his cave, and nothing can bring him out. But as soon as the night starts, he is completely awake. Many Dragons were truly afraid of him after they disturbed his sleep during daytime.