This book is on pre-order until book delivery arrives. 
 
The Blood Reign (The Blood Folk #1) by Kate Cunningham:
 
In the thrilling finale to The Blood Folk Series, war is looming on the horizon as the King of the Void grows stronger.

Aurelia has offered a blood oath to the king to keep Ven and the rest of her family alive, holding onto the scraps of herself as she remains bound to him.

With Aurelia trapped, Ven is desperate to find a way to free her while salvaging what remains of their people and the strained ties of their alliances.

Meanwhile, the pull between Karro and Valea becomes undeniable. But can she prove herself in a kingdom that sees her as an enemy?

Asher struggles to find his place as a human among the Blood Folk, but when ancient magick propels him into their world, he may find he’s capable of more than he believes.

When all of them are faced with the destruction of their world, will they be willing to embrace the darkest parts of themselves to tip the scales?