Vibratastone

In Reality Z-25 31-H, vibratastones were glowing, silvery-green crystals which could produce “quasi-harmonic tones” that were painful to symbiotes like Ghede Nibo. Matthias Geist's left armoured bracer had a ring of retractable vibratastones which he could control with his mind, which he used to torment Kate Five through her symbiote in revenge for Kate nearly killing his fiancée. (PROSE: Angel Falls: Vengeance)