「Rassilon」

Name: Rassilon
Age: Unknown, probably over 10,000
Species: Time Lord
Gender: Male
Home Planet: Gallifrey
Weapons: Rassilon’s Gauntlet
Rassilon’s Gauntlet was a weapon used by Lord President of the Time Lords, Rassilon. It contained De-mat technology that let him remove objects and individuals from history if he so wished. These same abilities allowed him to revert alterations to history.
Ship: Mark I Battle TARDIS
Battle TARDISes were the usual type of TARDIS used in battle. Contrary to the Games’ Type 40 TARDIS and other conventional TARDISes designed for time travel without the threat of attack, these were equipped with heavy armaments to engage in battle at a second's notice while being flown into hostile locations. The Celestial Intervention Agency made significant use of them. Their outer plasmic shells are composed of living metal, able to morph into shields and any number of predetermined gun emplacements. Their main weaponry were time torpedoes, which could be used to freeze time and thus suspend other vessels in the time vortex, but also included molecular disintegrator cannons earth shock bombs, klypstromic warheads, doomsday probes and temporal drone complements. Additionally, Battle TARDISes don’t possess any kinds of chameleon circuit. So Rassilon’s TARDIS always maintains its original form when it materializes.
Spoiler:

Personality: Rassilon was a charismatic leader who was capable of inspiring his people. It was stated that while Rassilon eventually became arrogant, insane and corrupt, he was once a good man. However, his wisdom in recognizing the curse of immortality and his opposition to the corrupting influence of power did not prevent him from becoming corrupted by power himself, becoming increasingly obsessed with avoiding death. After the loss of Omega, Rassilon wept for him. However, some believed Rassilon to actually be behind the plot to murder Omega. By the end of the Time War, Rassilon had become ruthless, power-hungry and insane, being willing to destroy the whole of creation rather than accept that it might be best for the Time Lords to die in order for the universe to live. He dreamed of changing himself and his fellow Time Lords and became obsessed with losing everything and being replaced. This eventually led him to corrupt the Gallifreyan law and eliminate young Time Lords with promise. Rassilon is one of the very few Time Lords, whose personas remained the same throughout their different incarnations.
Appearance: Rassilon usually wears modern Gallifreyan robes.
Reason for Regeneration: Rassilon I – Regenerated due to old age and fatigue.
Rassilon II – Using the Time Vortex to escape from the Fourth Games’ attack, he was exposed to the raw power of time itself. His body couldn’t endure the extra-dimensional energies and regenerated.
Rassilon III – Hasn’t regenerated yet.
Short Biography: Early Life
According to Coordinator Engin, in his own time Rassilon was chiefly regarded as an engineer and architect. Rassilon ended the Dark Time and the matriarchal society of the Pythia. In retaliation, the wrathful Pythia cursed her enemies and made Gallifreyans sterile.
War against the Vampires
Rassilon despised the vampires and began a purge to wipe them from existence. According to a transmission from Anathema (a dramatic reconstruction of Time Lord history, influenced by Faction Paradox propaganda), the war between the Gallifreyans and the vampires began before Omega developed the stellar manipulator, and thus before the creation of the Time Lords. This account held that when Rassilon first tried to harness the power of a black hole, they punched a hole into another plane of existence, and the Great Vampires swarmed out of it. Rassilon then led a campaign to eliminate the vampires from the universe, using bowships. The campaign was largely successful, but the swarm leader was not found. After the war, Rassilon wrote the Record of Rassilon, giving a history of the war and instructions to all Time Lords to kill the King Vampire if ever they came across him.
Foundation of the Time Lord Civilisation
Rassilon and Omega planned to make the star Qqaba go supernova. The energy released would enable the Gallifreyans to travel through time, to “become Lords of Time”. By this time, Rassilon was Grand Master of the Prydonian Chapter. A saboteur from the future, known as Fenris the Hellbringer, hired by the alien Order of the Black Sun, interfered and caused the “death” of Omega. The temporal technology of the directional control device on Fenris’ belt would prove useful to him. Omega was also betrayed by his assistant, Vandekirian, who, according to some accounts, was in fact working for Rassilon, who was jealous of his friend's popularity amongst Gallifreyans. Rassilon brought the Eye of Harmony, actually the singularity of a black hole, to Gallifrey. There it lay beneath the Panopticon. He invented TARDISes after a war with the Archons. He was implied to have created the transduction barrier that protected Gallifrey, the Looms that birthed new Time Lords and Ladies artificially, validium and the De-mat Gun. Time Lord history stated the traditions of their society began with Rassilon, including the principles of non-intervention (which may be the same as the policy of non-interference) after he had a nightmarish vision of a dictatorial, imperialistic Gallifrey. The Time Lords themselves may have been created by Rassilon: the genetic link that enabled Time Lords to travel through time without ill effects was known as the Rassilon Imprimatur. The physiological traits of Time Lords, including the ability to regenerate, were his creations. Some accounts claimed that Rassilon had implemented a flaw in the Time Lords’ ability to regenerate, meaning that they could only do so twelve times, where the Time Lords believed that this flaw in regeneration occurred naturally. Secret societies on Gallifrey were dedicated to the worship of Rassilon, Omega, and the Other.
Leadership of the Time Lords
Rassilon (at this time it was his second incarnation) led the Time Lords in the Millennium War, against the Mad Mind of Bophemeral. His memory of the event was erased, as happened to all others who took part in the war. Rassilon created the Alliance of Races in a war against the Hyperion. After the Hyperion were defeated, Rassilon and the Alliance of Races embarked on another purge of races that were a threat to universal harmony. One such enemy was Count D'if and his Cybock Imperium. Rassilon challenged D'if to a game of Rassilon's roulette using the Time-Gun of Rassilon. D'if lost and he was wiped from existence. It is claimed that this was the moment that the Gallifreyans first began to fear their president. Rassilon created a living weapon known as the Pariah, which he used for missions throughout time and space. Rassilon gave the Pariah independent thought. This proved to be a mistake; the Pariah developed a mind of its own and rebelled against him. Rassilon banished the Pariah from Gallifrey, then created Shayde, a more evolved version of the Pariah incapable of independent thought. The Pariah would cause the creation of the Threshold. Using temporal technology, Rassilon studied the future. He learned of the Divergence, a race which would eclipse his within ten thousand millennia. Fearing this future, he created a self-replicating biogenic molecule, which he sent back in time to seed all habitable planets in Gallifrey’s galaxy. This ensured all intelligent life evolved in the form of the Gallifreyans. He trapped the Divergence in their own timeline, which Rassilon sealed into a time loop.
Supposed death and survival
Many rumors surrounded Rassilon’s death (or lack thereof). One stated that the Time Lords had revolted and imprisoned him in the Dark Tower in the Death Zone. Some believed that Rassilon had discovered a form of true immortality beyond the regenerations known to Time Lords. Rassilon had indeed discovered immortality, but realized it was too dangerous a secret to share. Years later, he returned once again as the Lord President, but seeming to be a bit paranoid this time. He feared the thought of being replaced and tricked many promising Time Lords into exile. One of them, the Games, returned to Gallifrey with the same powers as Rassilon. At this point, the Lord President understood that he couldn’t just get rid of him. So instead, he recruited him. The duo worked for years together and became familiar with each other. However, the Games inevitably betrayed Rassilon and attacked him. Knowing that he could actually die, Rassilon entered the Time Vortex, thus escaping but making it look like he had been disintegrated. He made his next appearance on San Helios in the distant past and regenerated into his next incarnation due to being exposed to the raw power of the Time Vortex. Afterwards, he started to look for a weak spot on the fabric of the universe so that he could make his return to Gallifrey.
Revenge on Gallifrey
Rassilon had big plans for his return, that involved not only his own planet but the entire universe. While on San Helios he met several people, who told him about the planet’s origin and location from Galactic Zero Center. This helped him realize how far away he was from his home, which he used as an opportunity to prepare for his plans. He stole a spaceship from San Helios and went to several other planets to recruit people for his cause. But he kept doubting on their actual potential in fighting, so after several years he ditched his initial plan and went on with another tactic. He returned to San Helios, as the planet was rich on artron reserves. He used his own knowledge and combined it with the opportunities the planet granted him to open a time rift. He used this to return to Gallifrey, where he was greeted by the first incarnation of the Games. Though he soon noticed that it was all a scheme to trick him when the First Games addressed him as Lord President even though he hadn’t seen his new face before. Eventually Rassilon unmasked their plan and fought all six incarnations of the Games. He dominated them with medium difficulty, which prompted the Games to use his backup plan: using the Time Vortex to erase Rassilon from time itself. Though things went out of control and a companion of the Sixth Games, Gray, entered the untempered schism. Rassilon used this opportunity to snatch a Vortex Manipulator from the one of the Games’, and teleported to the Cloisters below the Citadel. He stole a Mark I Battle TARDIS and escaped after recruiting Gray to join him. The duo formed allied forces that consisted of great warrior races, with them gaining command in unusual ways. Though the Gallifreyan Army eventually emerged victorious from the conflict, the Games battled his companion to death and killed him. Seeing no other plan to follow, Rassilon once again escaped with his Battle TARDIS.
Special Abilities:
Unleashed Time Lord Abilities: Rassilon is known to be the first third generation Time Lord. He has removed the restrictive regenerative cycle from his body and accessed his true and natural powers. This process mainly revolves around the usage of regeneration: Rassilon can regenerate indefinitely, without having to change his appearance or alter his personality. By channeling the regeneration energy through different parts of his body, he can perform partial regeneration on his limbs or organs. During regeneration, Time Lords release an energy of more than 1.21 Gigawatts. Rassilon can channel this energy outward and release it as a devastating energy blast, making use of his power offensively.
Immortality: Rassilon has achieved Immortality through unknown ways.
Incarnations:
Spoiler: