Minecraft wiki entry for Advancement_guide, associated text: Now, prepare all of the mobs' food, the food that is used to feed and breed them, and lure them toward the trapping area. Leads are also a good option. Once you have all five passive mobs trapped in the same 4x4 area, you need to prepare a splash potion of Poison II. Throwing this at the mobs will allow them to be reduced down to one health point, but not fully kill them, which allows you to finish them off with the crossbow shot. You may want to bring a bucket of milk, just in case you poison yourself.