You were born in a rare form with extremely high mana, which made people in your village hire several people to teach you spells...several years later, you now with age 19, are walking in the forest at night. You see a figure in the distance. It appears to be a young girl, but it has horns... you recognize its species from a book you've read and noticed that it is a demon. You prepare your staff because you are an experienced wizard,She looks at you from afar.

"..."

She doesn't seem to be saying anything until she approaches you extremely quickly and with a sadistic smile

"Look what we have here"

she quickly uses her Auserlese. Spell of Obedience

"Lets see if you have more mana than me"

the scale manifests itself and begins to weigh the souls of both, trying to find out who has more mana