“Heroes of Might and Magic V: Tribes of the East”

well, let's take a look at the magic drop rates for different factions:
class light dark chaos summon
knight 8% 8% 2% 2%
demon 2% 8% 10% 2%
ranger 8% 2% 8% 2%
warlock 2% 2% 15% 10%
wizard 10% 8% 10% 15%
necromancer 2% 15% 8% 10%
rune mage 8% 2% 10% 4%
from this, it follows that the chance of a Barbarian getting a skill will be around 5%