I haven't seen a mage fireball do more than 3 hearts after testing it on multiple classes, it varies between 2-3 hearts of damage but 2.5 hearts seems to be the most frequent, I think it depends on where you shoot the person (feet body etc) that's still a very low damage and mage can't do much except harass archers since 1.9 regen removes the small amount of damage you can do with fireball.
TL
R: Make fireball do 4-5 hearts (as much as pre-archer nerf arrow) but increase the cooldown
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