"Do you need to do something else after absorbing an Umbra?" Roan asked, ignoring all that sentimentalism. "If so, focus on your task and make that energy your own."
"Yes, senior Roan!" Xian quickly circulated that new Shadow Energy in his body. Unlike other races, there was no core or dantian. That's why the twins felt it was similar to themselves. The Umbras' entire body was their soul, and they utilized the Shadow Energy to envelop it and keep the soul intact.
The soul itself existed with the Shadow Energy, which explained why Xian got so 'transparent' when he was almost without it.
As for using that energy to increase their level, it wasn't very complicated. As long as the Shadow Energy wasn't hostile, Xian was able to make it his own straight away. Xian only focused for a minute, and all that energy was already part of himself.
