Final answer:
Valdes and Cornelius are characters in Doctor Faustus who serve as Faustus' magical mentors and introduce him to the study of black magic.
Step-by-step explanation:
Doctor Faustus is a play by Christopher Marlowe that follows the story of a scholar who sells his soul to the devil in exchange for knowledge and power. Valdes and Cornelius are two characters in the play who serve as Faustus' magical mentors.
Valdes and Cornelius introduce Faustus to the study of black magic and teach him how to summon powerful demons. However, their influence leads Faustus down a dark path, as he becomes obsessed with his newfound abilities and uses them for selfish and immoral purposes.
In the end, Valdes and Cornelius are portrayed as corrupt and evil characters who contribute to Faustus' downfall. They are ultimately condemned to hell along with Faustus, as they too made deals with the devil.