I used an S6 starspawn to cast Will of the Fates (S4, 400 fatigue) and he burned 6 gems and landed at 82 fatigue in a neutral magic scale prov. 2 from his encumberance, so 80 from the spell. 80 is 1/5th of 400, so he cast it at an effective level of S8, so one level per extra pearl for fatigue purposes.
So, maybe commanders can potentially use as many gems as they have levels, plus one? Or, I wonder if an S5 caster could use 7 pearls to cast Will of the Fates.
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