Okay, good work. Now, did you get anything at all from killing it? I killed an epic in Tribal mode (rather easy with throwing spears to be honest), and the corpse had a ton of food on it. I'm curious as to how much DNA you get in Creature mode.
I'm glad there's no Achievement for doing it, though. That would be lame.
Oh, and that advice about doing bombing runs was great, Shinra. I especially like how colonies drop tons of cash if they refuse to surrender and blow up. I did find another way to deal with unfriendly empires, though. When you find one, and their "escort" starts shooting you, get to the planet and open communications. Give them money, then accept a mission, and they'll most likely stop shooting you. Doing missions is a great source of income, and makes them happy too. Also, never ever accept a communication from them. They don't seem to mind very much if you simply ignore them, at least compared to denying tribute. If you do a couple of missions, you can most likely leave them be until you're either ready to either conquer them or open further negotiations. Of course, they often ask you to attack other empires, so be ready to Delete their missions if they ask you to attack a friend.