Re'Kha shuddered in fear the more she thought about it. Her master was basically a being that was capable of pulling out mysterious results that have been unprecedented one after another like it was easy.
The first was the act of fusing two Pranic Hearts. She had inquired about it with Mu'Tua and learned that while the act was possible, it wasn't easy to perform. In such cases, the Pranic Hearts of the two individuals have to be carefully stitched and healed together.
Moreover, since part of it wasn't the owner's, it would cause a permanent resistance to the flow of Elemental Qi in their meridians. It would still function as a Pranic Heart, but their elemental affinity would experience a sharp reduction while even the pumping of the Elemental Qi in their meridians would become slow.