Trial By Fire by Vera Winters

A realm under siege. A mage caught between worlds. A bond that defies allegiance.

As demon hordes lay waste to human lands, Aric Solarian finds himself thrust into the heart of a war he once sought to prevent. The fall of Drindal marks only the beginning of a devastating assault that threatens to bring the human realm to its knees.
Caught between his duty to protect humanity and his growing connection to the enigmatic demon prince Malekith, Aric must navigate a treacherous path. Their forbidden bond deepens even as the lines of battle are drawn, challenging everything Aric once believed about his enemies.
But as a mysterious magical anomaly threatens both realms, Aric discovers that the key to salvation may lie in the very power he fears. Forced to undergo brutal trials that will test his loyalty and push him to his limits, Aric must decide how far he’s willing to go to uncover the truth.
With time running out and the fate of two worlds hanging in the balance, can Aric master his newfound abilities and find a way to bridge the divide between human and demon? Or will his dangerous obsession with forbidden magic be the undoing of everything he’s fought to protect?