Minecraft wiki entry for Guardian_farming, associated text: These No Drain Guardian farms are time efficient as they use the new 1.13 mechanics of soul sand to launch guardians upwards into a chamber that then directs them in various ways to a kill chamber, often using both lava and gravity. The size of the soul sand section can vary from just a small square to the full 56x56 area of the monument, with the bigger area giving greater drops and yields. The area from the monument floor to the surface must be completely clear to avoid any blocking of the guardians' ascent to the chamber which is often situated at the ocean surface. Note that large blocks of bubble columns can massively lower your FPS unless particles are set to minimal.