Intelligence gain

[VirtualPenguin]

How and how fast do you gain Intelligence in this game, I don't think mine has raised even one point yet...

[Larocco]

i think u just need to cast magic. mines gone from 20 to 28.

[AdmiralChaos]

Intelligence is one of your primary stat mods. It is also one of the hardest stats to raise in the game. So far the only way to raise it, to my knowledge, is by using magic.
Or buffs, of course. But those don't count.