"Excuse me?" Gabriel asked.
"Blood is the nourishment that Demon Avatars require to keep the body alive," Corwin leveled in a cold voice.
"Since the demon is no longer sharing a body with the deceased mage, the body is no longer an avatar. The demon has completely taken over, body and soul."
"Most people do not understand this soul-pact between mages and demons, so when they see the feeding habits of the demons, they call the Avatars vampires, but that is really not what they are."
"The demons are not blood-thirsty in the sense that they desire the blood of humans in a cannibalistic or gruesome evil manner."
"To them, the bodies need to be kept alive indefinitely by using human blood."
"Why would any mage willingly put themselves through something like that?" I shuddered.
"Because they're trained soldiers," Corwin said. "They've come to accept their mortality if it can benefit the greater cause.