[thejeff]

As I understand gem use, 1 gem can boost your level to cast the spell, others continue to boost your level but only for the purposes of reducing fatigue.
So, Earthquake is 3 gems?, E4. 300 fatigue.
So at 4th level they used 4 gems, 3 to cast, 1 to boost level, taking 150 fatigue.
With Earthpower, they'd be at fifth level to start with, thus could use 5 gems, boosting them to 7th (for fatigue only) taking 300/4 75 fatigue, allowing them to cast again.


That's without considering encumbrance or magic/drain scales. I've never really figured out how those figure in.

(Hopefully I didn't make any more stupid mistakes in that)