After the Great Rupture, human beings lost their "voice" - not deaf, but all words became empty talk. Only "Sound Evil" can tear apart the barrier of the shadow world, but it will turn the user into a madman.
There is a blind musician in the ruins, always holding a piano with broken strings. He said that the harp does not need strings, but uses bones; the sound does not need to be played, but uses the soul. Some people saw him sitting quietly outside his lair in the Shadow Realm. When the instrument vibrated, the monsters in the Shadow Realm would melt like snow.
When the last child who could understand the "stringless sound" was dragged into the fog, he smashed the harp against the Lord of the Shadow Realm, and his roar shattered the sky:
"It's time for the deaf world to hear my roar!"