
In my personal experience...
As long as the lore actually allows for people to take up multiple kinds of magic and/or professions, most treat it as a "you can know everything but only be a master of one" type of thing.
So if you want your character to be capable of using Thaumaturgy, Conjury, and Arcanima? That's absolutely fine. But it's good nature to have them only be particularly efficient in (or a master of) one of them. It's too overpowered to have your character to know enough of each of the disciplines to be capable of Black Magic, White Magic, summoning Egis, AND summoning fairies. But could they be a White Mage who can both summon Carbuncle and toss out a Fire spell ICly? I don't see why not.
However, you'll certainly tweak things to your own preferences and according to who you're RPing with.
As long as the lore actually allows for people to take up multiple kinds of magic and/or professions, most treat it as a "you can know everything but only be a master of one" type of thing.
So if you want your character to be capable of using Thaumaturgy, Conjury, and Arcanima? That's absolutely fine. But it's good nature to have them only be particularly efficient in (or a master of) one of them. It's too overpowered to have your character to know enough of each of the disciplines to be capable of Black Magic, White Magic, summoning Egis, AND summoning fairies. But could they be a White Mage who can both summon Carbuncle and toss out a Fire spell ICly? I don't see why not.
However, you'll certainly tweak things to your own preferences and according to who you're RPing with.