Blind Fight
Fighting the Veilures was much more helpful than Nial could have expected.
He had to comprehend Chaos in its entirety which meant that analyzing it with his dark energy and mana perception alone was not enough.
That was also why he used the energy distortion device he had manufactured in the territory of the Demihumans to seal his dark energy and make it near impossible to use his energy. He could still fly and move freely in space but that was already it.
Fighting against the Veilures without a trace of dark energy was what he had planned to do to comprehend more about the Chaos. After all, he could still use the Chaos that had accumulated inside his body, even though his dark energy was sealed.
Furthermore, he needed to use his other senses to fight the Veilures with their decayed Chaos.