Wolves’ Mate by Jasmine Wylder

The battle against War has begun.

The Magical Academy of the Dark has been destroyed. War has attacked the other houses, driving them from the Academy. Their secrets are falling one by one. Parker, Leonidas, and Jasper are on the run, stalked by bounty hunters.
As Leonidas and Parker attempt to combine the Pheonix Seed with necromancy to get answers from the long-dead house of Apocalypse, Jasper seeks out secrets to undermine War’s efforts. The net is closing tighter around them, though, and they don’t know how long it will be until the rope is around their necks.
When War reaches out to Parker promising to spare her Dark Princes if she gives up the Pheonix Seed, she faces an impossible choice—her lovers or her world? Can she save either one? Or has the apocalypse truly begun?