Beast Blood Essence
Beast Blood Essence had always been a highly coveted but equally dangerous resource in the cultivation world.
These essences were a core part of a beast, teeming with their life force, their Qi, their unique aura, and sometimes, their will. They were the concentrated essence of the beast's power, its potential, and all its possibilities.
This also meant that these essences were rife with the beast's impurities, contaminated with aspects that were wholly incompatible with the human constitution. Doing so was akin to undergoing a blood transfusion with the wrong blood type.
Attempting to merge such an essence with oneself was a gamble that often yielded mixed results. It really all depended on the beast's condition at the time of death, the extraction process, the compatibility, and the refinement/purity of the bloodline.