Fiery Edge of Steel

Lucifer and his army triumphed at Armageddon, leaving humans and demons living in uncertain peace based on sacrifice and strict laws. It is up to those with mixed demon and human blood, the Host, to prevent society from falling into anarchy.
 
Noon Onyx is the first female Host in memory to wield the destructive waning magic that is used to maintain order among the demons. Her unique abilities, along with a lack of control and a reluctance to kill, have branded her as an outsider among her peers. Only her powerful lover, Ari Carmine, and a roguish and mysterious Angel, Rafe Sinclair, support her unconventional ways.
 
When Noon is shipped off to a remote outpost to investigate several unusual disappearances, a task that will most likely involve trying and killing the patron demon of that area, it seems Luck is not on her side. But when the outpost settlers claim that an ancient and evil foe has stepped out of legend to commit the crimes, Noon realizes that she could be facing something much worse than she ever imagined…