Mythic Blood is confusing me.
"... you do not lose Fatigue levels if your Casting Total falls short of the level of a formulaic spell by less than ten points, although you do lose Fatigue if the spell fails completely."
OK, so if the magus needs a 20 and roll an 11, spell goes off and loses no Fatigue. Need a 10, spell always casts with no Fatigue. Need a 25, roll 12, fail and lose Fatigue.
"You must expend Fatigue normally to cast spontaneous magic, and if you fail to cast a formulaic spell you lose the normal number of Fatigue levels."
Is that second quote supposed to all be about spontaneous magic, or is it just repeating the earlier point about failing to cast, or is the text contradicting itself?