This series is kinda a slow-burn, if it wasn't obvious from the name of the series and cover-art its a magical school setting based on the concept of Necromancy. In that magic is considered a sub-category of Necromancy and its polar opposite is Holy Energy/Blessings etc.
It doesn't do anything too far from the general magic school genre, except that it focuses a bit more on college aspect of school systems, where students pick and choose their majors they want to focus on in the late future on top of whatever other mandatory coursework they are required. Most magical school series don't ever expand on the actual school aspect, whereas its usually used as a set piece more-often than not.