"Still, there was a limit to how much their bodies could endure. Once that limit was reached, they would die. The only difference was that they could not produce Vylkr energy naturally, just like his first subjects, and had to depend on harnessing Vylkr energy from other sources. However, what he initially counted as a setback was another tremendous progress.
"Regardless, that was all the progress he made. At that point, he gave up, deeming the entire endeavour a failure. He collected samples of the Vylkr energy and various other things, then made several arrangements before leaving elsewhere after ensuring that his tracks wouldn't be traced easily."
Her voice became sombre as she continued.