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To elucidate on this, Mephisto may be referred to in the tale known as Faust, there referred to as Mephistopheles; the so-called Faustian bargain is derived from it.

>Faustian bargain, a pact whereby a person trades something of supreme moral or spiritual importance, such as personal values or the soul, for some worldly or material benefit, such as knowledge, power, or riches.
Source: https://www.britannica.com/topic/Faustian-bargain