Trauma for the Neighbors by Tierra Cox

When Ione discovers a strange box buried in her garden, she doesn’t expect it to contain the ring of a long-lost primordial god. But the moment she slips it on, she’s bound to Athanasius—lord of death and darkness, and an infuriatingly smug immortal with an agenda of his own. Now tethered to a powerful being who’s less “evil overlord” and more “cosmic chaos with a flair for sarcasm,” Ione is thrust into a world of ancient magic, looming threats, and a bond that’s far more complicated—and thrilling—than she ever imagined.