Quote Originally Posted by dspeyer View Post
When I saw your question I thought of half-troll dragons and half-dragon trolls. They're very different.

It wouldn't work to ban them, though, because you never know when a base creature you want has a half- template for it somewhere.
Besides, that's how real-life hybrids work. Compare a mule with a hinny.

It gets worse in the above case, since if the mother is a troll they will presumably give birth, but if the mother is a dragon the hybrid will hatch from an egg.