Also, I would like to add that Soul Searcher is assuming all mutations to be harmful. This is not the case. A mutation is simply any random change in your genetic makeup. Have you ever seen someone (humans have it occasionally, but it's far more common in certain breeds of dogs) who has two different-coloured irises? That's a mutation, and it does not in any way negatively impact their chances of survival. Mutations can be very helpful, and improve an individual's chances to survive and reproduce.