The Adversary is an archetype found across cultures, manifesting as figures such as Satan, the Devil, Iblis, Mephistopheles, and Samael. Sometimes depicted as separate from God and other times an agent of them, this figure represents the inclination of evil in humanity.
Samael: in Jewish mythology he’s an archangel AND demon, whose name means “Venom of God”. He acts as the Angel of Death & has Satan-like roles, but he’s not considered necessarily evil. He’s unique because while he encourages men to sin, he remains God servant. Art: Gustave Doré