The Dink Network

So I've been in the dungeon for quite a while now, go around killing everything several times over, can't find the way out. The skull stone (?) says I need a key to open it... but where the heck is the key? I fear it is outside the dungeon (something I should have gotten ahead of time), but if that's the case, I'm looking at a full restart. I'd appreciate a hint, thanks!!

Nevermind, I found stumbled upon it -- bone of man, blood of hunter, flesh of prey. Thanks anyway. This dmod is nicely done!