Is it possible to use the ITEMCORPSE tag in a creature to drop another living creature? I had the idea that this could be used for multi-part boss-esque monsters, that just when you think you've killed them, shed their former husk to be a new more powerful thing, or a demon-possessed villager or creature that, when defeated, spawns the "original" benign creature.
Goes without saying I don't expect things as fancy as, say, lopped off limbs translating to the "dropped creature" or decapitations killing both. Heck, it worked for Xinchub...