Is it possible to change the Wither that we can spawn it in the normal world ? Nobody wants to rebuild his Wither farm because the reset so it would be easier to manage all of this "Sorry for my english"
The issue with spawning it in the normal world is this is where players have their islands. A wither generally doesn't sit still and let someone beat on it and it could float to a neighbors island and make a mess.
Can confirm setting up the farm every month is annoying. Totally agree though the reasons for world restricting it. What about a couple of alternative solutions? A) Allow wither spawns in the pocket dimension of spatial storage and never wipe player's spatial storage dimensions for active players - same as 2/4wk base wipe rule. May need to figure out a limit per player for the number of these things, not sure how you currently handle wiping these. This might be the most feasible and easiest solution. B) Introduce a new "farmworld" dim that doesn't reset. Could mitigate resource issues by making the dim a void world or something. Might not be worth the effort for just this spawning tho. C) Add to Mym plugin that automatically despawns wither if it ventures outside of the claim it was spawned in. Thanks for your considerations!
You should be able to spawn the withers in the random things spectre dimension with the next restart.