Originally posted by N.W.O.:

I have full troll lvl 2* but I'm getting my ass kicked in the swamp. I think Iron will be a nice upgrade

This was how it was for my wife and I. Had a hard time even breaking into the swamp at first. But it's not just the difficulty of the mobs there. It's a different approach. The more time you spend there, the easier it will get, and that will happen before you even start upgrading anything.

For us, playstyle became a lot less "tank and spank" from the Black Forest, and a lot more "take it slow, pay attention, and hit the enemies from afar". Once we adjusted our playstyle, the swamp was still difficult, but much more manageable. Adding iron after that was just icing on the cake. Made the swamp very trivial.