I don't really understand why Miasma III was named as such and not named Miasma II, since the old Miasma II was removed from the game. As-is, you have a Miasma spell, and eventually Miasma III, but II is just not in the game at all. It's a minor thing, but that's really weird, isn't it? Is this an oversight? Or is it so that both Miasma and Bio are level 3 when cast? Or something else?