Callidor's Tempest as a leveling skill has some significant performance and energy issues

[casedeck]

You’re doing it wrong.
For a good start, go through this whole thing:

[WIP] Beginner's Lazy Battlemage Diary

Introduction Sup guys, as some of you might know already there’s a community league that begins today, and I decided to participate in the HCSSF part of it so that I could, you know, snap “league starter” on my build, which would be quite badass. I’ve chosen this Battlemage to be my starter character. Battlemage isn’t a particularly good class and this build is expected to have mediocre single target damage, but as I’m not going to use it to clear high end league achievement…