Yup, what the guy above said. Also remember if you don't have magery, it'll just use the weapon skill. So a warrior can use, say, a mage wep -24 Kryss without any problem if they have in this case Fencing. If you have both magery and wep skill, well then I think it'll use the one that is higher(?) so like... -24 magewep Kryss, lets assume you had 120 Magery and 120 Fencing... 120 Fencing > 96 magery, so it'll work via the Fencing.