User blog comment:Skeith9/Heroic Spirits Speculation/@comment-42.118.15.228-20140818003501/@comment-24754018-20140819232939

Fafnir could be quite fun, good idea. He had a few neat things in his hoard that could be useful. His breath was poisonous, right?

As for mad enhancement, it's sort of muddy, and from what I've heard (though not confirmed personally) the case of Herc is different between versions. In the original, Illya purposely denied the power boost of M.E. but kept him mad, only to activate the boost later, while in Realta Nua, she simply boosted the M.E. in general. Or something. I suppose that has some basis, since certain skills can go up when supplied with enough prana.

I prefer to think it can't be turned on and off, but that's just because it suits my idea of the berserker class better. A mad beast that only turns mad when you order it to / it wants to seems to diminish the unwieldiness of the Berserker Class that I like. But that's just personal and has little bearing on the truth of the matter.