Minecraft wiki entry for Defeating_a_Nether_fortress, associated text: If you tend to die a bunch in the Nether, bring a respawn anchor. It will enable you to set a spawn point anywhere in the Nether. Bring glowstone blocks to charge it up. Make a safe room with a crafting table, and a chest to hold glowstone. You will know when it is ready because the top will have the nether portal texture, the circle will be full and the area will be lit up. Right click once more to set respawn. Be careful though it has only four charges. When you die, you will respawn there and it will use a charge. You can charge it up if you have more glowstone.