All natural mob spawns have been nerfed. This is why dark room grinders, enderman grinders and guardian all the same have a bad spawn rate. This not only affects the EBook market making it easier for players to gain levels consistently, but also contributes to server lag and the implosion of the market of the items the mob drops. The worst of these being iron golem farms, which like all the others, has been nerfed. Also, this is the same reason spawners and fix were removed, they have no place on an eco server.