User blog comment:B214/Question & Answers 5/@comment-82.199.209.134-20160426111856/@comment-24.113.129.70-20160426225231

Ok, how about this...

What power source do humans draw from to use magic?

Devils have "Demonic Power."

Angels and Fallen Angels have "Holy Power."

Holy Sword wielders have "Light Attribute."

Demon Sword wielders... I don't think they need anything but skill and stamina to use them.

What special "quality" or "power source" do humans need to use magic?

Any theory you have is welcome... as long as it's something that makes sense.