Dark Reckoning by Nicholas Bella

Hybrid Mages, Sage and Adrian, find themselves yet again, running out of time with everything they hold dear hanging in the balance. After performing a powerful spell that unleashed a dark god hellbent on bringing pure evil into the world, they now have to join the Council of mages known as the Echelon Imperial if they have any hope of saving all of humanity and supernals.
If that wasn’t enough to worry about, Salino, the new vampire emperor’s very existence is in jeopardy as the other remaining emperors pose a threat to his life. Angered by the repercussions to all vampires due to his actions, they want his blood to satiate their vengeance. That is something neither Sage nor Adrian can let happen.
With the clock ticking away, the magic & mayhem get entirely out of control.