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As implied by its name, the Cacophonic Conch closely resembles a real-life musical instrument conch. It is very long, with long pointy spikes on the outer surface and is colored dark purple. Also, its opening glows red.
Powers and traits
When blown into, the Cacophonic Conch glows red and gives off a low-pitched sound, which allows the user to inhibit the powers of nearby Zeti, including their ability to manipulate magnetic fields. The effect of the Cacophonic Conch is also very excruciating to Zeti, causing them great pain when hearing its sounds.
When Eggman chided the Deadly Six for collecting "underwhelming" Animals, Zavok spoke up against him. In response, Eggman used the Cacophonic Conch to inflict pain on the Deadly Six as punishment. When later meeting the Deadly Six in Desert Ruins, Eggman expressed his disappointment for their failures despite his effort to help them and blew into the Cacophonic Conch, inflicting the Deadly Six with pain again.
However, Sonic the Hedgehog and Miles "Tails" Prower arrived on the scene, with the hedgehog suspecting the shell was trouble. Ignoring Tails' warnings, Sonic knocked the conch out of the doctor's hands and into the horizon, never to be seen again. This was a terrible mistake, however, as the Deadly Six rebelled and took control of several Badniks before assaulting everyone present.
After the Deadly Six were dealt with, Eggman vowed to find another Cacophonic Conch to bring the Deadly Six under his control again.
In the Sonic the Hedgehog comic series and its spin-offs published by IDW Publishing, the Cacophonic Conch is a rare conch shell used to inhibit the power of Zeti. Its past is virtually identical to its game counterpart's, up until after the events of Sonic Forces. During the Metal Virus pandemic, Dr. Starline found the Cacophonic Shells and tried to use it to enslave the Deadly Six after he let them onto the Faceship. However, the Deadly Six managed to steal the Cacophonic Conch from him, which was later lost when the Faceship crashed.
An unused event story card suggests that the Cacophonic Conch was planned to appear in Sonic Runners before the game got shut down.
The way Eggman utilizes the Cacophonic Conch to control the Deadly Six is based off of the horagi (法螺貝,horagi?), the traditional Japanese usage of conch shells as trumpets.
In the Japanese version of Sonic Lost World, the Cacophonic Conch is not given a specific name, and is instead simply referred to as a "conch shell" (法螺貝,Horagai?).