Darth Erilis was the Dark Lady of the Sith circa 241 BBY. Sometime during her reign as the leader of the Order of the Sith Lords, she was approached by former Jedi Grandmaster Damien Nightblade. She introduced him to the ways of the Sith, and Nightblade became Darth Plagueis. He later replaced Erilis as Dark Lord of the Sith.