With these things said, bon appetite.
This is my favourite line. But, puns aside, I really liked the sub. Cannibalism as the bad guy is recurring, though not enough to be cliched yet. As was said above, I liked that this works for smaller and pettier foes.
However, I would like to note the rather rule-specific bent. I understand where you come from on this one, but it isn't necessarily needed. Most GMs can serve themselves the crunch to fit with your fluff if they have a mind to. In fact, most will need to either to adapt to a different system (Traveller Psionic-Cannibals, anyone?), or to give exact tables and numbers and die-rolls to what is provided.
Forgive me for needling what has already been mentioned more than once, Redgre. I liked the example, too.