http://wiki.ffxiclopedia.org/wiki/Category:Monstrosity
http://wiki.ffxiclopedia.org/wiki/Pankration

All they gotta recreate, so SE already has two systems in FFXI they could adapt for something like this in this game. I know the mantra is "FFXI = bad!" with the XIV community, but it really does show they at least tried unique systems in their MMOs at one point.