I was recently in a skype call with JPM and we were discussing a miniboss idea I had.
The boss would be an Aracnode and It would be almost tarantula like. I had the idea that it would shead its exoskeleton as you kill it, it then climbs up the tree and there would be aracnode eggs and aracnodes. Its final form would be an ordinary aracnode. (more updates soon)