Originating from a single species that thrived in ancient times, Xenowyrms have become an incredibly diverse breed whose appearances vary depending on their habitats. Each Xenowyrm subspecies is heavily reliant on the power of different types of mana, making them powerful magic users. Chronos are often considered to be the most elusive of all Xenowyrm subspecies: they live in the darkest and densest forests, far from civilization. They are masters of time magic, allowing them to manipulate the flow of time at will. It is said that Chrono lairs are protected by a field of magic that makes the minutes tick by at a slow pace for any unwanted visitors.

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.

Now taking over Malledus' position as Marth's tactician, Zeihan is one of very few Altean Xenowyrms, since the kingdom is not structured for a wyrm's way of life. Zeihan is endowed with a magnificent, detailed cape, embellished with the Time mana's symbol and golden tassels, on his head a tall and magnificent metal ornament locked around his horns, a single platinum piercing near his ear. For warfare, he decks his tail out in a series of articulated metal loops and thorny chains ending with a whip.

His most important skill is his natural ability to manipulate time. On the battlefield, since he can't manipulate it for an entire army, he simply adjusts his own perception and scopes out the opposing army in what seems like seconds to onlookers—he'll be back at Marth's side in moments, giving him thorough details on as many technicalities as possible—an immense advantage before a fight even breaks out.