Minecraft wiki entry for Guardian_farming, associated text: A rather simple guardian drop/XP farm design that places the AFK spot in the sky such that the despawn sphere around the player controls the mob spawn location to one corner of the temple, and the player won't suffer the effects of mining fatigue. Therefore, this design has no requirements to drain, remove, or conquer the monument. Due to the timed gatekeeping system in the Nether, the mobs are brought back to the Overworld, so the player is not required to be in the Nether at any time to use this farm. Scaffolding is used to both elevate the mobs and ignore the entity cramming limit.