Minecraft To simulate it, create a superflat world without structures at least 100 to 200 blocks thick for best results (any material that can be broken by wither skulls) Then, spawn at least several dozen withers at 0, 0 then set the world border to 100 or a few hundred Wait for a couple of dozens of minutes or hours (or use /tick sprint) When done on a superflat world made of non-falling blocks: Approximate Timelines: The withers would dig out a "basin" at the center of the area. The withers begin dispersing across the area of the experiment, although is uneven as the withers begin digging down at the northwest corner, making a near constant slope. The northwest corner becomes the deepest area, rapidly being dug out and withers form more "basins" on the sides and bottom. When done on a superflat world made of falling blocks: Withers would dig out a basin, like the previous scenario above. They would disperse unevenly, with most going to the northwest corner and going down. The difference is that the slope's angle stays roughly the same and there are no large basins on the sides. - Also make sure to delete the wither skulls every few dozen minutes or hours to reduce lag because they can go vertically or escape the world border (in rare cases when the wither is at the edge of the area)
mobs go northwest???