Sonic Key

The Sonic Key is an item found in the Dungeon's Golden Chests. It is used to open Sonic Chests in The Surge. It looks like a key made out of a piano.

Tooltip

 * "Do-re-mi-fa-so-la-ti-do!"

Trivia

 * The appearance and tooltip are a pun on the word key, as key can mean a musical key as well as a key that goes in a lock.