In return , the Devil says , Faust must give him his soul . Faust agrees , and the Devil lets Faust have a wonderful time , but in the end Faust has to go to Hell . He makes a bargain with Faust : Mephistopheles will serve Faust with his magic powers for a term of years , but at the end of the term , the devil will claim Faust 's soul and Faust will be eternally damned .