Zero Happily Ever Afters by MN Bennet

Dorian’s moving into his final semester with his homeroom coven, doing his best to prepare them for their third-year internships. After the events of last semester—the life lost and the futures altered—Dorian grapples with the role his magic played in that ordeal, and he’s determined to finally master the full extent of his telepathy.
Meanwhile, Milo officially joins the ranks of the Global Guild and works with the most elite witches in the world to track the deadliest threat ever to cross his path. A witch unlike any other. A witch capable of more destruction than the countless warlocks, demons, and devils that the great Enchanter Evergreen has faced in his career. A witch determined to shatter every happy ending.
In order for Milo to ensure the happiest ever after that ever aftered, he’ll have to help the Global Guild detain this new danger while preventing former enemies at home from resurfacing. As old visions return, new potential futures form, and Dorian must do everything in his power to protect his students from the worst possible outcome.