Minecraft wiki entry for Traps, associated text: If you have enough TNT, a dispenser, and an input, it can't hurt to pump some TNT into the End Portal. The TNT will go to the spawn point of the world and will be loaded, as the spawn chunks are always loaded, and will explode soon after. If nobody is in the end, the first player enter the portal will make the chunks load, which will instantly kill that player.