About 10 years ago I used to play a game called Magestorm. It was made by the people (Mythic entertainment at the time) who would go on to make Dark age of Camelot... Anyway, the game was a FPSer were you picked a job class (cleric, magician, arcanist, or mentalist) and you fought in teams of three. Each team would have as many as 20 people on it and you would have a base that the other teams were trying to destroy... on the maps were mana pools and your team needed to control these to have 'fire power'.
A lot of games probably fall into the category above, but in this game you had up to three characters and you had to level them up. After you gained a level you would be able to research spells. One interesting thing is that you could not get every spell with your picks so you have to choose wisely,... kinda like what you wanted to specilize in.
Is there anything like this today, this blend of FPSer and RPG? Also... I hate guns so any of that kinda stuff is out.