[@Roosan] Since everyone else is doing it...

Legio XV - Sons of the Storm - a legion who uses varied and flexible tactics based on the element of the wind/air; preferred methods are airborne assaults, fast attack and gas warfare. The legion also contains dedicated psykers capable of controlling the air (some might even call them...Air Benders), all under the command of their stoic but hard-as-iron Primarch Fū Xiá the Tamer of Storms.

So, there you go, because [b]someone[/b] has to be the Jaghatai Khan of this rabble of Caucasian miscreants. :lol

P.S.

Also had ideas for a ninja-like legion, based on a world covered in utter darkness, as well as a legion based off of the Maori people of New Zealand...because I'm original like that.

In the end, a legion of samurai IN SPESS and commanded by a theocracy of militant clergymen seemed like the best way to go.