[Endoperez]

I think the original Abysian would be a Magma Child, or at least modeled after one. It could be a size category bigger, but not that much. After all, Abysians are children of Rhuax, the Elemental King of Magma. I guess it would be possible to make him a pretender, but then it might be that anyone could resummon him if he died. He'd probably stay a pretender, but lose his nationality, and thus let one nation have two pretenders.