Well I had an idea maybe someone else already had it , at this stage of skyblock the enderman spawners are the most expensive in tokens and we can not do almost profit from them because they teleport out when you hit them or if they touch the water they also teleport out , then what I would like you guys to implement is a plugin or something where they cannot teleport so that Enderman's Spawners are not useless or maybe sell them for less tokens.
Since its a full 80 tokens more which is quite a lot, its better to either make the enderman spawner cheaper or indeed make something that they dont phase away when they get out of the spawner or something. I've seen people make enderman grinders in the past and they never succeed to make it a proper working grinder.
I kind of get your point, although I would probably go with something more like kachun's idea, because just taking endermen their ability to teleport seems kind of weird. If we would have something like an End-World we could make enderman grinders without having to change anything about them, because you can build enderman grinders in vanilla minecraft too, just by building them in the End and not giving them any space to teleport to. ~ WitheredToast aka. Toaster_21