Question regarding defeating 20 enemies of the same class
I understand that when you beat eight enemies of the same class you get a XP bonus. But then it tells you to master it by killing 20 of each class. What other benefits do you get from mastering it? Because when I beat the eight I get to see what they're dropping. However, I don't see any percentages or odds. I don't see any difference after have beaten 20 of them. Does anyone know what is the point of beating 20?