It's 1/2 INT, round up, for spells held in memory and levels that can be cast for a trained mage; 1/4 of each, rounded down, for an untrained caster. Elves are mid range in both at 1/3, round up. Base %'s, INTx3% for four spells to start for the mage, 25% for any spells known for non-mages. There is no minimum POW or INT for learning magic, for anyone, under the rules. A non-mage has to have a very high INT and POW before he has much capability with magic at all...he does not even get to cast 3 levels until INT 12, nor 4 levels unless INT 16+. It's not really a worry, no one is going to get to be the best at combat and magic in this. A trained mage can cast 8 levels at INT 16, the most an untrained warrior can ever cast is 4 levels, as above. A warrior with a spell or two has an advantage but not an overwhelming one. The mage is limited in weapons in a similar way, I think it was DEX x 4% with any weapon known. But they can use any weapon.
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