User blog comment:ProtonZero/Julius/@comment-4834593-20120613142847/@comment-4087140-20120613192925

A little bit. I don't like scaling mana costs with ability rank because then it feels like you might as well just have some form of energy champion. I want to make sure it really feels like leveling up grants you a deeper pool of resources. In addition, if you wanted to take advantage of the burst-casting that Slayer grants, it would behoove you to specifically target mana items.