According to the ingame description the Magic attribute increases the attack of mages. But it doesn't say by how much.
This is rather annoying as I was examining the Lyrium potion that increases Magic for a short time. I know it increases Magic by 30, which seems to be a lot, but I've no idea how much this actually increases damage and wether it is worth it.
So what is the exact effect of increasing the Magic attribute of my mage?