6 heal isn't the best, it's just a waste of a skill point. Especially at 15/16
The maximum heal you need is 5. Unless you're doing l15 pally mage, you're not going to need 6 for anything, I can probably beat a 16 mage with 6 heal, with a level 15 using 5 heal.
I would rather put it into drain than heal. And int will up your skill damage not just for mana regen lol
Plus there is a 15 mage guide by inveribrate which pretty much covers everything you need to know.
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