Colivar is a Kingdom plagued by seemingly random incursions from the Infernal Domain. For centuries, the Order of the Vigil has fought to stem the tide and preserve the Realm, but politics and uncivil wars have depleted their ranks. For reasons unknown, the High Prince of Hell has decided to lend them a hand in the form of a demon in exile. In the remote town of Lockrun, a teenager named Ara encounters a demonic assassin and somehow survives, while on the northern horizon the black cloud of another Horde blows in his city’s direction. Ara soon realizes the extent of the threat and must come to grips with a mysterious dark soul that shares his fight from within.