The Book of Azrael: Gods and Monsters, Book 1

Book one of Amber V. Nicole's viral dark romantasy series, Gods and Monsters. Dianna sold her soul to a demon centuries ago and has spent her immortal life as his most feared, most ruthless assassin. When she's ordered to kill the exiled god Samkiel, she expects an easy job -- instead she finds a being determined to prove that redemption is possible, even for a monster like her. Grief, vengeance, and a slow-burn forbidden bond drive this fast-paced, multi-POV fantasy romance, a BookTok favourite for its morally grey heroine and its blend of brutal action with genuine emotional stakes.