With a hateful glance at Rimuru (who was still ignoring her), Velgrynd began conjuring up her mighty magic force, running it through her body. The support provided by Raguel, combined with acceleration symbolized by her own heat, could be worked in parallel to forcibly heat her up—in other words, boost her performance. The results allowed Velgrynd to go thousands of times faster than the speed of sound—the fastest physical speed of anything in the world.
So what happens when the target of this power is someone other than herself? As a spiritual life-form with resistance to physical attack, Velgrynd has no problem withstanding this newfound performance—but could anyone else ever withstand it? The answer is no. No matter what kind of life-form it is, no physical body can endure continuous forced acceleration. The same is true for spiritual ones—even passing thoughts are converted into energy, ultimately leading to thermal collapse.