Board Thread:General Discussion/@comment-24772070-20170202222702/@comment-25936766-20170608005750

You are looking at the problem from the wrong angle, and not taking into account some facts.

We do not know how the Faunus came to be. We do not know why they can only have 1 trait of X animal. And especially, we do not know why 2 Faunus of different species can have a child that is neither of those species.

That last detail is what you should focus on. They don't have to specifically explain how X Faunus can have Y "impossible" trait. But if they explain that last question, then we have an idea of the answers to the rest.

Once we know why Dog+Cat=Anything, even non-mammals like Snakes (which is already a middle finger to biology and genetics as we know it), we will know how people like Tyrian can have traits that are a middle finger to biology and genetics as we know it.

For example, if the answer to that question is effectively "Magic", then it magically answers your question about Tyrian; "it's Magic, it is not required to adhere to logic". Any specifics behind said "Magic", would actually help at finding out how/why Tyrian has a scorpion tail.