Cacophonic Conch

The Cacophonic Conch is an item that appears in Sonic Lost World. It is a very rare conch shell based on a real-life musical conch. When blown into, the conch produces a low-pitched sound that affects a nearby Zeti, naturally inhibiting their powers, but causing them great pain.

Prior to the events of the game, Dr. Eggman acquires the conch from an unknown location and uses it to enslave the Deadly Six. Whenever the Zeti fail to do a good job or try to speak up against him, he inflicts pain on them as punishment. When he tries to punish the Zeti at Desert Ruins, Sonic intervenes by kicking away the conch into the distance, never to be seen again for the rest of the game. This was a terrible mistake, as it allowed the Deadly Six to take control of Eggman's Badniks and rebel against the doctor.

It is implied that more than one Cacophonic Conch exists in the world, as Eggman vows to find another one to take the Deadly Six under his control again at the end of the game.