How many factions are there?

Ideas for new factions can be found on the same forum in the "New Ideas" section. But when it comes to magic, that's a bit more problematic. I can come up with new schools of magic, considering the redistribution of the old ones. I once worked on a team that created an online fantasy game that never saw the light of day, so I have a lot of ideas. But the challenge is to make these schools of magic fit the concepts of the factions.