Leviathan, Ramuh, and Shiva should have a Mistmare

Garuda, Titan and Ifrit have the chance of not only dropping their own elemental ponys but the black Nightmare which is a slight combination of their elements

Leviathan, Ramuh and Shiva should drop something similar thats also a combination of their elements
the Mistmare since water,lightning, and ice are more closely related

I mean we have Nightmares unless Mistmares are the samething, im not too sure on their bestiary in FF

what do you guys think?