Samael, is an archangel who has had many roles, the most important being that of destruction and death as well as he is an accuser and a seducer. He is known as Ha-Satan, or The Adversary, though not to be confused with Lucifer, Satan in Christianity.
Samael is necessary evil, mostly being the Instrument of God's judgement and standing as God's left-hand, acting as the arbiter, executioner and prosecutor.
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In Hebrew lore, Samael is the infernal count, and he is known as "God's Poison", and is the executioner of death sentences decreed by God.
Depending on tradition, Samael can be a fallen angel or he can be seen as an angel who is still loyal to divine law but enforces the darker side of faith (in either form he can be considered as Satan or a unique entity in his own right). He could be the embodiment of corruption and amorality. Samael also the Ruler of the Fifth Heaven aswell as the head of all the satans (adversaries/arbiters).
A trait of Samael different from Satan is that even when depicted as a fallen angel he is said to be under the command of the Lord - as opposed to being a direct enemy. Though malevolent, this doesn't mean Samael is pure-evil nor a demon, as he tempted or seduced not to damned humans, rather to test their faith, to see if their faith is strong.
In Israelites lore, Samael was equated with the Serpent of Eden, who tempted Eve into sin. He later seduced and impregnated her with Cain. Samael then became the consort of Adam's first wife, Lilith. Their demon offspring include Sariel, a son also known as the "Sword of Samael". Fearing that Samael and Lilith would plague the world with their heinous progeny, God castrated the corrupt angel.
In addition, while an angel, Samael can mostly be seen as God's executioner and assassin, acting as the angel who do most of the dirty works for God. He is associated with Mars, the left side, the north, and Tuesday. He was created to be a tempter and seducer of angels, men and beyond and he served as God's instrument to test the faith and loyalty of others.