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A demon emperor with enough power to genocide entire pantheons grows weary of the underworld and decides to make a home for himself in the mortal realm.
He has no desire for anyone to know who or what he really is. He has lost all interest in conquest and petty squables.
While he is still evil, he has begun the slow and painful path to antihero status and possibly, eventually redemption.
Hiding his true power, he has disguised himself as a wandering knight.
He has also chosen you to be both his disciple and his guide. Offering you knowledge power, and training in exchange for you teaching him how to live as a human.
What do?