Minecraft wiki entry for Nether_survival, associated text: If you've mastered the Nether, you can go in and start making a nether fortress more habitable. If you can have control of a nether fortress on a multiplayer server, you can control who enters the area, and also control who gets blaze rods (as blazes spawn only in nether fortresses). Mine down most (if not all) the netherrack covering the fortress. Make any surface where you don't want mobs with trapdoors or slabs. With the addition of nether quartz, the one who controls a fortress can also control who gets nether quartz from the area.