Sword of the Morningstar - Rise of the Fallen, #3

Radu's kingdom shatters under the weight of the darkness. Forced to rule when his brother retreated from the world, Radu set aside all comforts and joy to take care of his people and try to fix the continued Fracturing of worlds. Not even leading armies into other worlds, and commanding a dying race of incubi vampires, could have prepared him for Yuri kneeling at his feet, begging for help, control, and love. But a monster from the past, festering in the thriving shadows of a thousand worlds, has taken Yuri hostage.
Cut off from Radu, Theo, Lucian, and Star, Yuri descends into a whirlwind of destruction, leaving the darkness within him to expand and demolish all the remaining worlds. Radu has to find a way to remind Yuri of his lovers, and regain control, or the darkness will devour everything. As the world crumbles around Theo and Lucian, they fight their way to Radu's side, seeking to free Yuri, and reunite him with Star, even if it means the end of all creation. Includes Afterword short: Dance with Me