The ducks are preparing your content!
Stack Spawners keep farms cleaner by combining mobs into a stack instead of filling the area with separate mobs.

Follow this order when your stacked spawner reaches 500 (MAX):



Use this quick table:
| Requirement | What to check | Quick fix |
|---|---|---|
| Player range | You are within 16 blocks of the spawner | Stand closer and test again |
| Area permission | You are allowed to interact with the spawner in that claim/region | Ask owner/staff for access, or move to your own allowed area |
| Spawn space | One block above the spawner is valid (air, water, or lava) and not blocked above | Clear blocks around/above the spawn point |
| Block below | Most mobs need a solid block below the spawn point | Add a solid support block |
| Light level | Hostile mobs usually need dark (7 or lower), many passive mobs need bright (7 or higher) | Add/remove light sources |
| Water/lava rules | Water mobs need water, drowned needs water, strider needs lava in Nether | Match the mob's fluid requirement |
| World/biome/special cases | Some mobs only work in Nether/End or specific biome/height | Move spawner or switch mob type |
Here is the same logic in plain words:
slime, bat, glow_squid, strider, and water mobs have extra checks.If everything above is correct and it still does not spawn, replace the spawner once and test again.
If none of these work, run /stackmob check to see exactly what requirement is failing.
Need more help? Contact us at [email protected]
Back to All Guides