Seli'une (Extra Information)

I have decided that it would benefit everyone to have some background information about the setting and population.  So I have made this for my benefit, and everyone else's.  So I hope you find this helpful!

The world:

The country that the humans and the Seli'une live in is called K'kyri.  The Che'tigro live in the country of Vargo'iu.  

K'kyri is a temperate climate region, with some tundra climate up in the northern territory.  The northern, western, and part of the southern border is the Sarfinsch mountain range.  The eastern border is the cool North Sea.  The other part of the southern border is the Gara'ia River.  It feeds out the the North Sea.  K'kyri has many deciduous forests that end in a large plain by southern border.  

Vargo'iu is a desert/grasslands region.  The northern border is the Sarfinsch mountain range and the Gara'ia River.  The northern territory is grassland, which extends out along the foothills of the mountains, and the Che'tigro have made all of the grasslands their territory.  The western and southern borders are wherever the inhospitable territory is.  The eastern border is the North Sea.  When the grassland ends south of the mountains, a desert continues as the rest of the territory.

The people:

There are three main humanoid races.  The humans, the Seli'une, and the Che'tigro.

The Seli'une is a mostly human species.  The only difference between them and humans is their hair, eyes, and their power to absorb energy and nutrients from people, animals, or plants, alive or dead.  When a Seli'une is born, they have white hair, which turns a vibrant color at age sixteen.  Their power also develops around age ten.  The eyes of a Seli'une may be a regular color, or a color such as purple or orange or yellow.  About half of the Seli'une race consists of the subspecies, Metaliac.  These Seli'une have a metal-toned hair color, and are named after the metal their hair symbolizes.  Their hair generally  begins to turn from white at age ten, and their powers begin developing at age five.  These Seli'une are generally more skilled with their ability and have a greater capacity for energy.

The Che'tigro are a feline-like species.  Their white or black skin is striped either orange or blue,  and they are completely carnivorous.  They can eat vegetation, but Che'tigro get hardly any nutrition from it.  They can also eat raw meat.  The Che'tigro are equipped with sharp claws and teeth, much like a tiger.  Their black hair most likely has stripe or spot patterns of the same color as the stripes on their skin.  The race is nomadic, going where the prey goes, much  like the early nomadic humans.  However, they claim territory as their own, and don't venture far from their own territory.  They expand their territory by either claiming it as theirs, or taking it by force, much like an empire.  The Che'tigro live in three clans that travel together, but the clans band together when they must fight for more territory.  The orange-striped, the blue-striped, and then the multi-color-striped.  The eyes are much like those of a cat, with oval pupils, and reflective lenses.