Yeah, that's kind of what I'm describing - a 5-headed hydra doesn't advance to a 6-headed hydra by gaining a HD, the 6-header is an entirely separate monster. All Hydra monsters have similar traits, but there is no unified 'Hydra' creature.<br/><br/>Besides, Multiheaded is the template to turn anything into a 'Hydra' creature, I'm pretty sure a Multiheaded Hydra is spiritually redundant (though ironically, it's legal even without our type restriction freedom). You definitely don't get to double-dip by adding a head and getting a second and third head free like some demented infomercial. :D