Minecraft wiki entry for Nether_survival, associated text: Once you've gotten used to Nether dangers, you can invade and repair a nether fortress, as it provides many Nether commodities, such as blazes and nether wart. However, falling is a real danger, as there might be a lava ocean below you. If you're in survival, and you've found multiple nether fortresses (not connected but nearby) you can loot nether bricks to repair your favorite nether fortress. You can smelt netherrack into individual nether bricks, then craft your own walls, stairs, and fences. You can also transform bastion remnants in similar ways. For bastion renmants, block off any lava, and fill in any gaps. Try to fix up the jagged edges of the bridges/walkways. Make the bastion into an bartering farm/magma cream farm. Add decorations and fix up the bastion.