Board Thread:Suggestions forum/@comment-26486187-20151014233432/@comment-25841881-20151015025943

That could possibly work, but there are still ways to exploit it. One of them, for example, is a large area of enemy land claimed with banners so enemies can't spawn, then having a small area unclaimed so they could, and then having a complex built around that area so your NPCs could attack the enemies that spawn but not vice versa.