Grasshopper, the class was made to be but a half-caster. It is forbidden to expend more celestial energy than is revealed in the class table under the final heading: 'maximum energy cost'.

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When I was making the class, I equated celestial energy expenditure with spell level. So a third level spell is comparable to using 3 celestial energy.

I also made an Astromancer class, which is pasted in my signature. They are a full caster, and can expend 9 celestial energy points at later levels.

On another note, I'm fantastically glad you are playing a class I made!

I hate to bother you overmuch. But I'd love to know your character's back story, and continuing snippets if anything cool happens. And, of course, mechanical concerns. You can PM me so we don't clutter this thread.