Minecraft wiki entry for Music_disc_farming, associated text: Before getting the skeleton to kill the creeper, you will first want to lower the creeper's health as much as possible. It is recommended to use a Diamond Sword with Sharpness III and Knockback II. Two fully charged non-critical hits with the sword will drop the creeper to only 1 heart of health which will make it require only one skeleton arrow to kill. Once the creeper has low health, either get between the skeleton and the creeper, or line yourself up so the creeper is directly in between you and the skeleton. Either way, when the skeleton is shooting at you then the arrows should be able to hit the creeper. When the creeper gets too close, you will need to move away and try again. It will probably take multiple attempts so be patient!