Minecraft wiki entry for Tricks_and_Traps, associated text: As a Hunter, one of the worst things you can do is let the runner use portals. In order to beat the game, the runner has to visit both the Nether (to collect blaze rods) and the end (to beat the dragon and thus win the game). However, this can be difficult to stop as the runner is going to be bent on reaching the portals. Nether portals are hard to stop players from making, as lava pools are fairly common around the world, but if you use a water bucket you can turn the lava into obsidian and make it much harder for the runner to make the portal. If you are in the nether you could use beds or TNT to break the portal or kill the runner when they come through.