It may be related to their genetic structure rather than their blood.

This world is still shrouded in mystery to us, but yes I look forward to working with you all the same.

As for the specifics---What kind of magic are you familiar with and how frequently is it used?

[No one uses magic in the Far East Branch. The closest thing they have to it is the Power of Blood. It activates through their will but it isn't exactly magic either.]