In order to implement his new 'mech as beast concept' in his Blood Knight Project, he needed to select an appropriate 'blood donor'.
This was an extremely important decision. Ves needed to take into account a lot of factors. Strength, safety, risk, compatibility, willingness and more all varied considerably based on his selection.
Based on these factors, Ves drafted up a list of names and steadily whittled it down until he ended up with three possible candidates.
These were the names that scored the highest in the aforementioned criteria. They were also so different from each other that they presented an interesting array of unique options.
"Venerable Joshua should be an excellent candidate."
This was by far the safest possible choice that Ves could make.
Every other extraordinary being within reach developed unique domains that granted them a strong advantage in a specific area.