I'll do you one better: how about a huge, part-organic energy leech? I didn't see it personally, but Galvatron, Cyclonus, and Scourge apparently ran into one in Cybertron's lower levels.

[They're gonna need one hell of a BBQ pit to cook all this pork later. That is, if anybody's want to eat it.]

Feel free to join in the blasting any time you like. I'll keep any from getting close enough to mess up your finish.