Wither Arena

This is more of a suggestion. Because I'm not sure if I should add this or not, because it has some bad things coming with it, anyway here it is:

Wither Arena
To access the arena you simply do /warp Wither and you'll end up in a safe lobby. From here you can enter the arena which has a Wither spawner which spawns withers. Here you can battle them and defeat them and get Quick XP and the Nether Star. If the nether star is crafted into a beacon it's worth quite alot on the market which means quick money. The withers grief ability would be disabled so they cannot break out.

Downside
To make this possible, I have to allow wither spawning again. Which means I have to once again blacklist soul sand to prevent the wither from being spawned outside the arena. I've tried to blacklist the wither heads only but it does not seem to work. Why? I don't know.

This was suggested by Minecoder500
Please leave your thought below, if they are posetive, this will be added shortly.

It will make the server lag cause someone can sit afk there and the spawner will keep spawning

Are you sure the spawner does not have a limit?

I am not 100% sure ^_^

why dont you add mob arena and a boss at the end that would be cool and safer

But why blacklisting if the wither's griefing ability is disabled?
If somebody spawns a wither(permaban), sure, it would generate a bit of panic, but not many incidents would happen(cuz of permaban).

You got a point there david. But right now the only problem is the amount of withers a single spawner will spawn. If it's unlimited or over 10 this might not happen :I

normally items such as heads use the same id as all the other heads but with like this at the end :1 or :2 or whatever if you just blacklist the front id on its own it will only ban steve heads
me thinks its like that with wood

and also theres probably a lot of plugins out there what can limit 1 type of mob in the world

ill do some tests

ok blacklist this id 397:1

why dont you make a new world for the arena so that it will bve able to spawn withers there and not in the world you should try it its good

multi world plugins can be very laggy

why wither arena when enderdragon arena is better, put a button in the end at span so when ppl click it an enderdragon spawns so when the enderdragon attacks at the safe zone you wont get hurt but the only way to hurt the enderdragon is by bow, this is a garunteed way of getting xp