Originally posted by MDMchan:

I just started a new game and haven't tried this after the update, but you can still build a base in the swamp trees, right? I had one base at least 30 feet up in the air, nothing was able to touch me besides the ghost/wraith. I was just trying to get the green goo from the swamp trees one day and just kept on building higher and higher. I don't think the swamp is a practical base location but I did use it. I could repair my troll armor there and build arrows if I needed to. Just thought I would mention it as an option.

Yep nothing changed you can build treehouse in swamp and castles on top of those huge stones in plains.