Darth Regius, born Sedjem Keded, was a male Pureblood Sith Lord who served the Sith Empire as the personal apprentice of the Sith Emperor, Darth Vitiate. As the leader of the enigmatic Emperor's Hand and the Emperor's most trusted underling, he held the titles of Hand of the Emperor and Second Son of the Emperor, and after the death of Syo Bakarn, the title of First Son of the Emperor. He was also the first Sith Master of Caspian Zavarai.
Born into the aristocratic Keded family on Korriban, Sedjem showed signs of Force-sensitivity from an early age. During his early childhood, he was inducted into the Sith Academy to be trained as a Sith acolyte. Sedjem showed enormous strength in the Force and proved to be a vicious and merciless murderer, easily defeating all his opponents during his first year as an acolyte. Shortly before his seventh birthday, he was brought before the Sith Emperor himself, deep beneath the Sith Academy. He was only the second child brought before the Emperor, after Syo Bakarn, and became a Child of the Emperor, being imparted with a small part of the Emperor's essence. In the weeks after he was subjected to heavy brainwashing and rituals to make him a conduit of the Emperor's will. After becoming an extension of the Emperor's will, Sedjem reassumed his training as a Sith acolyte as if nothing had happened, not remembering anything about the prior events.
In 3670 BBY, after many grueling years of Sith training, Sedjem was brought before the Sith Emperor again. By this time he had grown into a young teenager. The Emperor touched Sedjem's mind via telepathy, after which Sedjem bowed and pledged eternal loyalty to him. Vitiate began training Sedjem as his personal apprentice, only his second one after Exal Kressh. When he reached the age of 18, Vitiate deemed Sedjem's training complete, anointing him as Darth Regius and as the Second Son of the Emperor, the leader of the Emperor's Hand. As the Emperor's most trusted servant out of all his servants, Regius retained his free will, although he was completely loyal to Vitiate.