Darth Kaenus

Darth Kaenus, known as Giladril before becoming Sith, also known as The Nightmare, was a human female who was the leader of the Sith Quadrumvirate and fought in the last Jedi-Sith war during the Fall of the Old Republic.

Born on Ithulus with three sisters, Giladril and her siblings learnt they were force sensitive during their childhood and left their home as teenagers to find a place to exact their power. Eventually they were all imprisoned on Mandalore for trying to steal the darksaber from House Vizla.

In 1054 BBY the sisters were freed during the Mandalore Cataclysm when the Mandalorian-Jedi war came to an end. They flee to the ancient Sith World Moraband where they planned to rebuild the Sith. After performing a ritual that called to all practitioners of the dark side across the galaxy, the 4 sisters formed the Sith Quadrumvirate once the dark warriors of the galaxy joined them. Giladril declared herself Darth Kaenus, or The Nightmare among her enemies in the Republic.

At the end of the war in 1032 BBY, Kaenus was betrayed by Darth Echdys and his lover Darth Syto, who was one of Kaenus' sisters. She was assassinated by Syto during the Moraband Cataclysm. Darth Lachron and Darth Nexu fought against Syto and Echdys which led to the destruction of the Sith for the next 1000 years, with the exception of Darth Bane who created the Rule of Two.