Minecraft wiki entry for Defense, associated text: Players with elytra can raid from the sky, making walls useless (unless it's seriously tall). This causes the need for air defenses. As of recent updates, dispensers shoot fireworks in the direction they're facing, instead of just up. One can build a missile launcher this way, using the quasi-connectivity method stated above, or with a rapid pulsar. The fireworks will explode in the aerial attacker's face and hopefully kill them. However, flying attacks makes the defensive area a 3D space, so multiple launchers may be needed in multiple directions. Range can be altered with the firework's flight duration. This can be used for intimidation purposes rather than actually defending.