Hi Kitty Kat, I just now saw this question. The graves and the HellRaiser puzzle generate the fog.

There is a fog piece you can put down, or was anyways that was an item all on itself. Once we put it down however we couldn't pick it back up lol

Hmmm sounds like you’re stuck with fog FOREVER... ha actually I hope not. On many of my items I let you place them even if there is collision. But that means the part you see to pick them up might be buried. You could try placing something else on top of it and maybe it will break the fog maker? Or one time I had a structures plus foundation buried too deep in the ground and it too was stuck. We put explosives on it and was able to demolish it that way. The last method would be to remove the mod.. ugh. That one sucks the most if you have lots of cool stuff setup. Sorry 😐