I had a idea that I posted in a comment. My idea was I wanted the dark horses to randomly spawn like all the other horses in worlds, and they would act the same as any other horse you can ride them and tame them (Or maybe tame the skeleton horse with bones not wheat, and the zombie horse with rotten flesh instead of wheat) And maybe if you can the zombie horse like a pigman where if you hit it, it will start to attack you. And maybe the skeleton horse hostile or like a pigman. Thanks! Hope you like my idea!