What system works best for a magic school campaign?

If you want the school part to matter, I would lean toward a system that makes character growth and resource management visible. The sweet spot is usually something flexible enough for custom spells, but not so crunchy that every lesson turns into bookkeeping.

One workable angle is to treat the school year like a series of terms. Each term gives the group a few big choices, like classes, research, social drama, and a risky project. That keeps the campaign feeling academic without needing every day at the academy to be played out. You can also use downtime style rules for experimenting, learning new techniques, or writing up discoveries.

If the group wants a more scholarly tone, build in consequences for failed experiments. Not just damage, but weird side effects, reputations getting dented, or rival students getting ahead because they published first. That kind of pressure makes the whole academic vibe feel real.

I would actually go rules light if your main goal is school drama and magical atmosphere. The more the system cares about fine combat detail, the faster the academy stuff gets pushed to the side. A lighter engine lets you focus on exams, rivalries, secrets, and all that messy student nonsense.

For the magic itself, you can make spells more open ended and attach costs to them. Maybe every big effect needs a weird ingredient, a risk roll, or a condition like stress, exhaustion, or unstable notes from a mentor. That gives magic a sense of discovery instead of just picking from a spell list.

The nice thing about this route is that you can shift tone pretty easily. If the table wants cozy school life, lean into clubs and friendships. If they want darker mystery, the same framework can handle forbidden wings of the campus, missing faculty, and a bunch of sketchy research.

Another approach is to make the campaign about institutions, not just classes. The academy can have factions, grant funding, publication status, rival departments, dorm cliques, and formal approvals for research. That gives the players something to push against besides homework.

Then let each character have a specialty and a weakness. One is good at practical casting, one is good at theory, one knows everyone, one is a disaster with deadlines. When they work together, the game starts feeling like a proper school story instead of a generic fantasy party with uniforms on.

If you want a more unusual angle, the school can be old and weird in a way that changes the play. Maybe the curriculum is partly magical, partly philosophical, and partly impossible. Students spend as much time interpreting dreams and dissecting old texts as they do casting spells. That sort of setup makes research and interpretation as dramatic as duels.

If you already like a system with experimental magic or downtime creation rules, that is probably the easiest starting place. You can reskin almost anything to be a school if you give it a calendar, house points or the equivalent, and a reason for students to keep poking at forbidden knowledge.

My practical advice is to keep the campaign structure simple. Make a loop like this. Class, one personal problem, one group problem, one research or field assignment. That keeps everyone involved and gives each session a clear shape.

Also, do not overbuild the school map at the start. You only need the parts that matter right now, like classrooms, library, dorms, infirmary, and the one place students are definitely not supposed to go. Fill in the rest later if the players get curious.