Reginleif High-Frequency Blade

The enemy was still invisible. No — it was hardly noticeable unless one focused on finding it, but there was a slight wavering in the air, like a heat haze… Like the flapping of butterfly wings swaying in the dim light. Tracing the incomprehensible wailing voice, he focused on that single wavering point — and drove his high-frequency blade into it. The blade sliced through the heat haze, which was only slightly visible even at this short range.

The blade was capable of cutting through a Dinosauria's composite armor like butter, but in the next moment, its vibrations were interrupted by opposing vibrations, and a vector of the opposite direction forced both blades and the enemy fuselage to deflect off each other. The high-pitched screech of metal rose up, cutting through the blue air.

    - 86; Volume 4, Chapter 4​