Sorry, I thought you were being snippy. 
It's honestly never come up. It's a conflict between the worlds of flavor/reality and game balance. We'd probably just gloss over the onyx in the mouth thing... "Rise, my minions!" doesn't really work when you need to run around. Now, if the guy had a chance to prepare, then there'd be a gem in those mouths... but not if he got jumped.

It's honestly never come up. It's a conflict between the worlds of flavor/reality and game balance. We'd probably just gloss over the onyx in the mouth thing... "Rise, my minions!" doesn't really work when you need to run around. Now, if the guy had a chance to prepare, then there'd be a gem in those mouths... but not if he got jumped.