So because Ars Fan is being extremely thick, let's open up the actual page 78 definitions:
Muto, 5th edition wrote:By using Muto magic a magus can grant or remove properties something cannot naturally have. Thus, Muto can give a person wings or turn her skin green, or turn a person into a wolf. The difficulty of the magic depends on the extent of the change, so that turning someone’s skin green is easy, but turning someone into a golden statue is difficult.
Muto magic cannot affect the properties that something has naturally, although it can add other properties to them to mask their effects. Thus Muto magic can neither injure nor kill someone directly, although it could render her immobile, by turning her to stone, or kill her indirectly, by turning her into a fish on dry land so that she suffocates.
Now, those of you who aren't mouth breathers will notice that that description contradicts itself repeatedly despite its brevity. Also you'll note that since it has everything to do with "properties" (undefined) and whether or not they "
can be natural" (also undefined), that there is essentially no chance whatsoever of finding two storyguides who agree on what you can and cannot do with Muto. No two people agree on what is and is not a predicate, nor can you find two people who agree on what properties are and are not things that
can occur.
We could get into deep philosophy of time dependent traits or traits of number to get really weird arguments ("What happens if I give myself the trait of 'only surviving member of House Anjou?'"), but it actually falls apart way earlier than that because of the whole "naturally" thing. Any trait you
don't have is one which in this particular time line is one that you can't have had at this moment. But we're pretty sure that's not what the book is talking about, and that it's actually talking about some sort of alternate history hypothetical. That being the case, holy fuck why does it list
green fucking skin as something that could not occur in nature? There are
lots of natural ways to get green skin, fro m hypochromic anemia and gangrene to just eating a lot of dark leafy vegetables or soaking yourself in dye. What is or is not natural would seem to be horribly confused and impossible to untangle even from the examples in the book, but it's
actually worse than that, because not only are the limits of nature undefined in the game but you could very plausibly be talking about nature
as understood by 13th century Christians. Or more precisely, the limits of nature in an undefined hypothetical of different events occurring in a context of natural laws that are to an undefined degree based on the limited knowledge of actual physics and medieval philosophy of the person sitting in the storyguide seat.
Muto is a badly defined thing. If you wanted to defend Ars Magica as not being a clusterfuck of incomprehensible gibberish, Muto is not the hill you want to die on.
-Username17