Kyu, The Unknown, Book 1
The Coming of Dis.
The Territories have been unified for a thousand years, brought together under the sword of Harra Ardrassis and the sorcerous power of his immortal sister, Haena. But the Unification has always been contentious; hostility and distrust grows stronger every year. Surrounding the Territories is the Disian Curtain, a desolate darkness filled with ravenous, twisted horrors beyond imagination. Ruled by Infernals called the Diaboli Domini, these terrors desire nothing more than to devour the flesh and souls of all humanity… And the Disian Curtain is encroaching ever closer.