Minecraft wiki entry for Nether_survival, associated text: Once you get enough diamonds, make only a diamond sword and pickaxe. Don't make the other tools. If you can, make some diamond armor. The next step is upgrading your items to netherite. Make a smithing table and start mining. If you have a strider farm, breed striders and kill them for string. Make as much wool as possible and prepare beds. Go underground, and use beds to blow up areas. 4 ancient debris yield 4 netherite scraps. 4 netherite scraps + 4 gold ingots makes an netherite ingot. Using the smithing table, upgrade your equipment to netherite. Next, find a good place to spawn the wither. It is recommended to spawn it in a large flat area. Reinforce the area with obsidian, as many layers as you want. You should reinforce the base with as much obsidian as possible, just in case the wither flies away and hits your buildings.