Kizil Yukselis - Pierce Brown «Limited Time»

The frequency was not electromagnetic. It was acoustic, riding the heat vibrations of the planet’s core, channeled through the very plumbing of the Golds’ fortress. Every enemy soldier heard it: a woman’s voice, cracked as dry earth, singing of a mountain that turned red with the blood of the righteous. The Obsidian auxiliaries dropped their shields. The Gray conscripts lowered their rifles. The Gold officers clutched their temples as if the song were a knife—because it was. It was the knife of collective memory, the one thing their society had surgically removed from every color below them.

The Golds fired into the crowd. The crowd kept singing. Kizil Yukselis - Pierce Brown

Not because of an EMP or a boarding party. Because a woman named Sefika, too frail to march, too old to fight, had been smuggled into the spire’s geothermal vent shaft. She had no weapon. Only a portable vox-caster and a single recording. The frequency was not electromagnetic