Quote Originally Posted by coffeerox View Post
Another thing is that you don't use Energy Drain. Energy Drain is 150 potency, instant, and returns 50% of damage dealt as MP. This is an especially great spell for mana sustain because it scales with gear. The better your gear, the higher damage you do and thus, higher MP returned.
The HP restore scales, the MP restore doesn't. But yes, I use it sometimes if I really have to, because it's better to sacrifice a fester to make sure you don't go oom.