I’ve been doing empty buildings with two height walls, with 4x6 foundations and a door with a walkway and stairs… Zero defense, zero decorations… I get maybe one or two low level purges, then anything else “can’t setup a camp”, tried C7 and F7, even tried just foundation and stairs in the volcano as some YouTube videos show…
I’ll just search around for the thralls available from purges and admin spawn them…
Purges are fun when it decides to work, but not spending hours trying to find the “sweet spot”…