Omens of Chaos — Seanan McGuire

Strixhaven University welcomes you. Begin your magical studies on a faraway plane, encountering new friends, mysteries, and dangers, in this fantastical dark academia.

Eula Blue was supposed to be a mage. That was before the war came -- before the fight for the Multiverse devastated Eula's home, and with it her hopes for a magical education.

But the destruction of the war also brought something new: the ability to travel to other planes. And when Eula receives an invitation to study magic at a distant school called Strixhaven, she leaps to take it.

Eula's journey brings her closer than she ever thought possible to her fellow students, including the mysterious Segante, a boy whose secrets Eula longs to share. But not everyone is thrilled by the arrival of the new class, and Eula and her new friends quickly become targets.

To make it through their first semester, they'll have to fight for their place in this new world -- or else they'll be dead before their final exams.