While they are slow to age physically, their minds develop at a very quick rate. It is not uncommon for a Seiliu to appear around 10 years of age, but have the mental capacity and knowledge that one could only gain from decades of experience.
It generally takes centuries for Seiliu to physically age just one year, making it impossible to determine their true age by their physical appearance.
Pronounced See-Lee-oo, they are a type of Sylvan creature that was long suspected of being extinct.
In human form, they appear lanky, typically between 5'8 and 5'11.
Seiliu have thick copper or red tresses (usually unkempt) and pure Seiliu are marked by their golden colored hues.
In equine form, their appearance varies greatly. No two Seiliu bear the same resemblances. Patterns, mane and tail color, eyes, and even antlers differ amongst each Seiliu.
Those who are of pure blood (male and female) have antlers while in their equine form.