"Father thinks to have perfected the method to harmonize Zor's life forces and he's putting his theory to the test. As you know, his and Zor's condition is very similar." With her troll and black cores, Xenagrosh's physiology was the closest to Vastor among the Eldritch-hybrids.
The Master had developed a Chaos and a Decay eye that worked similarly to Zoreth's cores and they were also stable. Vastor had studied the changes in his body and hoped that once applied to Zoreth, they would work for her as well.
She was his first successful hybrid and if the experiment even just furthered the merging of her life forces, he could use the collected data to find a procedure specific for each of the other hybrids.
"Dammit and congratulations." Lith sighed. "How long will it take?"
"There's no way to tell." Bytra replied. "From a few seconds to one more week tops."
"Can you come with us?"
