I know one, and I hope it is not rejected due to spoilers. I just feel I should share this with everyone. Three bosses in Mooshu drop three seperate Exclusice Spells. I have gone out and tested this with my friends. The spells i am referring to are Ninja pigs, Goat Monk, and Samoorai. I will not give away the locations of the drops, though they are real spells that they drop. Start farming some bosses, and hope for luck. Sorry I couldn't give the other piece of info, but I know that what I posted is already a mega spoiler. Please make do with this comment, and don't put my account in any trouble. I feel everybody should know.Thank you.