With the hole Magnastar was able to open up in the Omnidroid, Cassie knew it was time to finish this. She made a gesture like a conductor urging the orchestra to a crescendoed finale, easing her hands in front of her, palms upward. The acoustic traps she had laid out switched back to the frequency that she believed was as close as she could get the droid's resonant frequency and amped up the volume. A perfect shape, like a sphere, was great at redistributing stress. However certain stresses, like harmonic stress, tended to concentrate at flaws and imperfections: chips, cracks, fractures, etc. It was Cassie's hope that the hole Magnastar had carved would be a great focal point for her acoustic stress to concentrate, and that the material, while a metal and therefore malleable, was hard and brittle enough to actually start shattering.