Off To Citadel.

When Shi Lang said that the blood refiners might dwell in the federation, the council was thrown into disarray. Finally, commander Silence raised her hand, and the murmurs stopped. Then, she said, "General Shi, go on." 

Shi Lang nodded, saying, "The blood refiners are spiritual cultivators like us. However, their methods are gory and deadly to others. Absorbing spiritual energy from the atmosphere is very slow. However, it does not have any side effects. While absorbing spiritual energy directly from the blood of a practitioner can provide instant strength." 

He looked around at the people and continued, "Do not think trying it on any prisoner will be nice. The side effect can alter the personality of a person completely. Along with the spiritual energy from the blood, you will also be absorbing the bad thoughts and negative energy that person must have felt against you when you were doing such a thing."