The first time I killed Zagan I got my butt handed to me numerous times. However, during my current play through, I just summoned a friend, then concentrated on Zagan. I hit him a few times, flew to the cave opening and transformed into a human. In the same instance I got the message that Zagan is dead. Everything happened so fast, I was like huh? LOL I had to re-load the game to believe it.
I was like I'm missing something! I didn't destroy any nests and didn't kill any of the other bosses. Zagan is rather weak if you hit him a few times. (playing on Normal setting).
If an area gives you too much grief and you are too frustrated, no harm in turning the difficulty down to casual.
