Even in Death by Randi Garner

Fate be damned.
Now imprisoned in Moros, buried deep in the Land of the Dead, Finnian is determined to right a wrong he made centuries ago. Somewhere in the hellish landscape is his father, and he intends to find him and flee their chains together.
Cassian, the High God of Death and Curses, has one desire: get Finnian to confess where he’s hiding a valuable weapon—one deadly to deities.
For centuries, the High Goddess of Fate has plagued Cassian over a dispute that took place between them long ago. Desperate to end her antagonizing once and for all, Cassian grants Finnian with a choice to either hand over the weapon or endure one of his curses.
The Kiss of Delirium.
After centuries of using necromancy, stealing the High God of Death and Curses’s souls, and playing a heated game of cat-and-mouse, Finnian knows all the ways to crawl under Cassian’s skin. Racing against the silent clock of the curse chipping away at his sanity, Finnian must figure out a way to outwit his long-standing enemy and learn the whereabouts of his father before his mind erodes entirely.
However, the more their fates begin to tangle, the more old feelings ignite.
Chaos is inevitable.