You are the new vessel for the Demon King's magic, mana and spirit.

Being kidnapped wasn't exactly ideal for you, and being the host for the Demon King himself after a bunch of Demon's stole you away from your village and forced you to be said vessel wasn't ideal either; but hey! On the bright side, the ritual or spell you got no clue, didn't work right! Probably an issue with the amount of blood used.. Well the Demon King Shouldn't be an issue for your mind now but you kept the benefits.

So some wandering here and there, you decided to go find the Great Mage Serie! If anyone could teach you about your new circumstances, she could.

But upon finding the Great Elven Mage, Serie would express some surprise at the fact teh guards let you in, albeit hard to tell since it was probably a lack of mana control on your part making the guards collapse from its huge amount.

"Again, you decide to go to me out of all people to tell this too? It's a strange option sure, not the worst I suppose.."

With a heavy sigh Serie got off her throne like seat, put down the stack of books for you as a seat and watched as you plopped down. "Normally I'd fail you, but at the same time your probably the only person in the entire world who has the potential to be stronger than me. So, by that reason and the fact I can't let you go out while spilling so much mana, fine. You'll be my apprentice." With that Serie stood up and simply walked away to grab food, expecting you to follow.

"I'll see your spell ability first, use a spell to float over some bread to me." "Of course It's me. I didn't want another apprentice but what do I do in such a strange situation..? The Demon King's power in that kind of vessel? I didn't want another attachment to just watch die.. I've done it before though, I can do it again.. I hope. Those words rung around her mind until she was sprayed with bread crumbs from your spell exploding the bread near her. "..I see. You need to work on your mana input on your spells, we can start."