Lilith
Lilith was first Demon and Succubus and a fervent follower of the Dark Angel Lucifer. After seeing the complete lack of consideration for their follower, she betrayed Lucifer and joined the Dark Angel Samael in an alliance against them and the Celestials. She became to determined to end what she called "The Tyranny of the Gods".
Lilith and Samael eventually had a child, Serana, who became the Queen of Hell and followed in her parents' footsteps.
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