Filler for now, will be filled in more later. Suggestions are more than welcome, and should be directed to the FTB Thread or the Minecraft Forum Thread
Basic Progression of Magic:
1st stage (with Magic in it): Magic User(s)
2nd stage: Magic Masters; 1st [type of magic] Noble. Noble opens School of [type of magic]. Schools of Magic may only teach one type of in-game Magic per School. Magic that is not physically possible via vanilla or mod game mechanics may be taught at Schools of Magic (if you need inspiration, you need look no further than Earthsea, the Potter series, the Kingkiller Chronicles, etc.), i.e. Divination, Care of Magical Creatures, Arithmancy....
3rd stage: More [type of magic] Nobles. College of [type of magic] opens. Colleges of Magic may only teach one type of Magic per College. Magic that is not physically possible via vanilla or mod game mechanics may be taught at Colleges of Magic (if you need inspiration, you need look no further than Earthsea, the Potter series, the Kingkiller Chronicles, etc.), i.e. Divination, Care of Magical Creatures, Arithmancy....
4th stage: Arcane University (inspired by Oblivion's Arcane University) opens. There is only one Arcane University in the country, and it teaches all known forms of Magic (that have reached at least its 2nd stage and have at least one School already open).
School/Colleges of [Magic]/Arcane University are prime candidates for Outlier possibilities (i.e. Hogsmeade, Imri, etc).
Vanilla Schools of Magic:
Enchanting
Portal-making (Nether, The End)