Nightmare Rarity Guide
Some Nightmares are much rarer than other Nightmares, here is a short guide of what features the Nightmare would include to have that rarity.
Common
No Special Features
Normal Colors
Uncommon
No Special Features
Not So Normal Colors
Rare
Items and accessories
Small mutations (extra toes, fur variations, etc)
Very Rare
Big mutations (extra bodyparts\lacking bodyparts etc)
OMG SO RARE
Extreme mutations (over 50% line edits)
A lot of accessories
Nigthmare Mutation Guide
Nightmares have a robust genetics capable of producing nearly any mutation imaginable. Scientists still havent discovered all the possible mutations these unique animals can have. Some of them might be weird, seem unnatural and even not physically possible, but so far there havent been any lethal cases in mutated nightmares. The only limitation in mutation is it's rarity, as it has been proven that the bigger % of the body mutation takes, the rarer it is to occur and pass onto the offspring in breeding.