From the wiki:"Entity Activation Range(top)Mobs, animals & items that are not in water are frozen if you're not within the following amount of blocks from them:Town: 12 blocks for animals, 16 blocks for mobsWild: 12 blocks for animals, 32 blocks for mobsNether: 12 blocks for animals, 32 blocks for mobsEnd: 12 blocks for animals, 32 blocks for mobs.Wastelands: 12 blocks for animals, 32 blocks for mobsItems in water are not affected by these ranges, and should still move provided that a chunk in every direction is loaded.Things such as crop growth on farms are not affected by this.Only the X and Z axis' are checked, there is no Y axis check (meaning mobs above and below you are not affected by this)Note: Vanilla also has similar logic as this for monsters at 32 distance. So movement logic for monsters is essentially unaffected. However, Vanilla's logic also includes a Y distance. This Vanilla logic is planned to be removed so natural spawn grinders will function better.~ snipe" This says mobs are not effected by the Y distance, I do not think that is correct. From our testing it seems 32 is applied to the Y as well. Can anyone please confirm or deny this assumption? And does anyone know the min distance a mob can spawn away from you? Like mobs will spawn 5 (??) blocks to a max of 64, but can only move 32 blocks away?? *edited*Yes, I am making an exp farm, my tools need repair badly and all of them need 39 levels each. So I would prefer to make something that will spawn lots of exp. Any tips would be extremely helpful. Thanks in advance. BTW, I don't care about drops too much, normal mob drops are more than good.