Dawn of a Burning World
The Mozoku are a group of Evil Humans that live the frozen tundra. They are comparable to Mongols and tend to only leave their territory for seemingly random acts of evil.
A nomadic people, the Mozoku are adept horsemen, matched only by The Lords of the Plains of the Khan. While much of their time is spent foraging and surviving in the harsh landscape they call home, each summer the Mozoku attack its neighbors for pillaging rights. Occasionally the Mozoku will expand their territories in these summer assaults, but each winter they retreat to their homes in the north with their ill gotten gains and allow their conqoured land to relapse into the hands of the original owners.
The last two years, the Mozoku have not retreated from their conquests. It is rumored a new leader guides them.