[llamabeast]

Yes, I thought the same. I have a feeling the manual is wrong on this point, hence the widespread confusion. I can't remember any more, but I did read the manual carefully when I first got the game.

A side-effect of the same point is that you can't use more than one gem to reduce fatigue either (as fatigue is reduced by gaining a temporary level). Therefore the maximum number of gems a spell can use is (gem cost of spell) + 1. I'm almost certain the manual is confused on this point.