Yep, that's fine for now. It's a system for the end game but I need to find the right balance for it. It's meant to be a really powerful enemy for you to defeat as the game progresses so for now, you can imagine he's so powerful that you're barely able to hurt them :)
Glad you've gotten so far though. I've not even tested it to that extent. The numbers theoretically shouldn't break, but I have a feeling you'd be the first to find out! :P