"Heh, I remember as if it was yesterday despite it being millions upon millions of years ago. You see, the other nine archdemons had taken most of the demonic army and handed me about a million imps and 20.000 demons to kill your ancestors. By that time most of your ancestors had died in battle, three of the last four were killed in combat by me. When the last fourth one came, she said that she is willing to... well, "wed" with me on the condition that I take my army and join hers to kill the other demons."

"And I could've said no and killed her on the spot, but damn me if she wasn't the most beautiful woman ever, so I agreed, half of the army agreed with me, the other didn't, so I slaughtered them and well... you know the rest of the story, after the battle, me and my 20.000 demons snuck inside Nastrond and from here you can imagine how your half-demon ancestry came up and where  your guardian Devils came from, well the demons weren't immortal, but their blood still runs through those battle fields you call Guardian Devils." He said smiling at Nieldun.