Suddenly Kain recalled that after Aegis seemed to extract the abyssal energy from the target and reshape it for his own use, Abyssal creatures seemed to have no means of manipulating it any more. Perhaps they could make use of that?
"Aegis," Kain said, his voice steady despite the desperation clawing at him. "Instead of draining the energy as it comes into the machine, can you let it through, but focus on converting it into your own use? Of course, you don't need to fully convert the abyssal energy into that stone you've been making, start with little changes to its properties and we'll go from there after seeing the effect.
Aegis tilted his head, his glowing eyes meeting Kain's. "I… can try."
"Do it," Kain urged. "We'll buy you time."