Rhulk, Disciple of the Witness

Rhulk, Disciple of the Witness is one of the Disciples, extraordinarily powerful Darkness-wielding beings from multiple species who collectively follow and do the bidding of the Witness. Hailing from the planet Lubrae, he commanded one of the Pyramids of the Black Fleet, having been most recently sent to Savathûn's Throne World to assist the Witch Queen by spawning Worms for her Hive. After Savathûn's rebirth in the Light, he was imprisoned within his own Pyramid by a curse of Light cast by the Witch Queen. He is the final boss of the Vow of the Disciple Raid.

Early Life
Rhulk was born on the planet Lubrae, a civilization that had been blessed by the Traveler but fell into a military dictatorship after it left. When The Witness arrived, the planet was already fracturing as one of its moons was being destroyed. Rhulk would be betrayed by his family, as they didn’t follow his race’s ideology, and he fell into an existential crisis. When The Witness arrived to the collapsing planet, it took in the troubled warrior and made him into one of its Disciples, possibly the first.

Fundament
Rhulk would later serve as the Witness’ instrument in subjugating the Worm Gods, forcing them to serve the aims of the Darkness. He swam into the depths of Fundament, meeting the Leviathan on the way and grievously injuring it by removing one of its ribs. Upon finding the Worm Gods at the core of the planet, he created a strain of miniature versions of the Worms, their so-called "larvae", which could be implanted into a host. He then left the Worm Gods to be found by the proto-Hive, abducting their sixth member and mother, Xita, the Nurturing Worm as collateral.

Savathûn's Throne World
At some point Rhulk was ordered to station his Pyramid in Savathûn's Throne World, assisting Savathûn, the Witch Queen in the production of Worms for her brood. After her claim of light, he would be trapped within a Sunken Pyramid, blocked off from the rest of the realm thanks to her usage on the Wellspring. After Savathûn’s defeat by the hands of The Guardian, who was attempting to free the Traveler, along with numerous raids on the Wellspring by both the Guardians and the Scorn, the spell that once trapped Rhulk would begin to fade. Eventually it would finally break as the Guardians had attempted to investigate the sunken Pyramid and was greeted by the Disciple, and would give tasks and challenges to the Guardians as they boarded the ship, aided by both Scorn and Taken forces. After they reached him, he would see no use in them anymore and tried to eliminate them, resulting in a climatic battle. Though it was not an easy task, they would finally bring down and kill the Disciple.

Personality and Traits
Rhulk seems to be completely devoted to the darkness and even despises the guardians for the usage of darkness. He is mildly egotistical, thinking he is above all who oppose him and even taunts the guardians while fighting them. It seems like while in the pyramid, he befriended the worm familiars and the worm god, being the one who would have to create the worms for Savathün’s brood. He seems to like experimenting with the worm familiars as well, as in the acquisition part of the raid, you can see frozen scorn/fallen in containers with worms attached to them. These experiments may have failed.

List of appearances

 * Destiny 2
 * The Witch Queen

Trivia

 * It is possible that he or his race is partially responsible for the introduction of glaives into the hands of Guardians, evidenced by Rhulk's personal glaive, Lubrae's Ruin.