Librarian - Notable Librarians: Each Chapter has a Chief Librarian, the strongest and wisest psyker in the entire Chapter. A psychically-powerful Astartes often becomes the Chief Librarian by virtue of experience or by demonstrating exceptional self-control and willpower, both vital traits for an Imperial psyker. Below are named some of the most well-known Chief Librarians of the Space Marine Chapters of the Imperium of Man.Chief Librarian Tigurius - Tigurius is the Chief Librarian of the Ultramarines, a masterful telepath rumoured to be the most powerful of all known Adeptus Astartes psykers. It is said that he touched minds with the Tyranid Hive Mind and survived - a feat previously considered impossible, as the psychic weight of the Hive Mind would overload the telepath and subsume his soul. His equipment enhances the power of his psychic abilities, doubling their maximum range.Chief Librarian Mephiston - Mephiston of the Blood Angels not only survived the Black Rage, but also greatly benefited from it. His gaze is so terrible even the most disciplined heroes would quiver in his line of sight, and he possesses the ability to fly with his own power. He is a close-combat-oriented Librarian, and is perhaps the greatest Space Marine swordsman in the known galaxy.Grand Master Ezekiel - Ezekiel is the greatest of all Dark Angels Librarians and has the ability to traverse the minds of his enemies, predicting their moves before they even think of them. His Mind Worm psychic power can cause an opponent's brain to literally melt and the destroyed brain matter then leaks out through the ears.Hestion - This Librarian of the Salamanders Chapter played a valuable part in the first major conflict between the Imperium and the Dark Eldar in the 35th Millennium. He served on the strike cruiser Forgehammer when it was crippled by Dark Eldar raiders and taken through the Webway to Commorragh. With no means to call for aid, he saved the ship's complement by sending a psychic signal to the Astropaths of the Salamanders with the stricken vessel's coordinates. During the battle that followed in the Dark City of Commorragh, Hestion smashed many Dark Eldar gunships with a psychic storm and bought time for his battle-brothers to destroy the gravitic salvage spars holding the Strike Cruiser in captivity, allowing the Forgehammer to fly free again.Rune Priest Njal Stormcaller - While not officially a Librarian, Njal Stormcaller serves the Space Wolves ]]Chapter\\ as their most senior Rune Priest, the non-standard Chapter's closest equivalent. Njal earned his surname for his ability to summon potent storms through the power of his mind and the observation of the most ancient of Fenrisian shamanistic rituals.Chief Librarian Jonah Orion - Jonah Orion is a powerful psyker who served as a Librarian of the Blood Ravens Chapter under Captain Gabriel Angelos, Commander of the Watch and leader of the Blood Ravens' 3rd Company, since the Tartarus campaign. During the First Aurelian Crusade, he was one of the Chapter's Librarians tasked with battling against the Tyranid Hive Mind of the encroaching splinter fleet of Hive Fleet Leviathan who had entered Sub-sector Aurelia intent on devouring all of its worlds. This bought time for Captain Gabriel and his Company to make their way towards Aurelia. While traveling through the Warp, Jonah would end up being the sole survivor of the dozen Librarians, Navigators and Astropaths accompanying Captain Angelos. Following this ordeal, Jonah's powerful psychic abilities would play an instrumental role in rooting out several pockets of Tyranid bioforms left over from the original invasion over the following year. Jonah fought against his Chaos-corrupted, daemonically-ascended Chapter Master, Azariah Kyras, upon the Dead World of Cyrene, and was thought to have been mortally wounded during the final push to Kyras' position. Miraculously, Jonah survived his grievous wounds. Understanding the gravity of Jonah's sacrifices for the Chapter and his undeniable role in their victory against the Arch-Traitor Azariah Kyras, the newly-appointed Chapter Master Gabriel Angelos promoted Jonah to the rank of Chief Librarian.Ahriman - Although not a Librarian of the Loyalist Chapters, the Chaos Sorcerer Ahriman had been the Chief Librarian of the Thousand Sons Legion during the Great Crusade and was infamous for his journeys throughout the galaxy, ransacking vaults and looting any Chaos or sorcerous artefacts he could get his hands on that would increase his own power or knowledge of the arcane. This caused many custodians of such artefacts, including several Space Marine Chapters, a great deal of paranoia and has resulted in the preemptive destruction of many artefacts to keep them out of Ahriman's hands. Ahriman is also responsible for turning the entire Thousand Sons Traitor Legion into mindless automata whose souls have been fused with their Power Armour through the use of the infamous spell known as the Rubric of Ahriman.Sarpedon - Sarpedon was the Chief Librarian and later, Chapter Master, of the Soul Drinkers, a Renegade Chapter of Space Marines that is currently considered Excommunicate Traitoris by the High Lords of Terra. Sarpedon possesses the unique psychic power known as The Hell that allows him to psychically enter and then project his opponents' greatest fears along with a recent physical mutation giving him extra appendages, manifesting in the form of chitinous spider legs which were unwillingly bestowed upon him by the Tzeentchian Daemon Prince Abraxes.Israfael - Israfael was a Chief Librarian of the Dark Angels Legion during the Great Crusade. He recognised Zahariel's latent psyker abilities during a competition with his cousin. He also vouched for Zahariel after he stopped an assassination attempt on the Emperor. Like many other Dark Angels, Israfael was sent back to Caliban after the short fighting on Sarosh.Elikas - Elikas was a Chief Librarian of the Dark Angels Legion during the Great Crusade. He voted in favor of keeping the Legion Librarius in existence during the Council of Nikaea.Targutai Yesugei - Targutai Yesugei was the chief Stormseer of the White Scars Legion during the Great Crusade and the Horus Heresy. Targutai had fought alongside Jaghatai Khan since their youth on Chogoris. Yesugei was known for his close relationship to the Khan, serving as his chief adviser and de facto executive officer within the Legion. At the Council of Nikaea, Targutai argued in favor of the responsible and limited use of Librarians and psykers in the Imperium and promised they could be a powerful weapon against the enemies of Mankind. During the Horus Heresy Yesugei remained on Chogoris while his Primarch was leading the Chondax Campaign, but sensed something was amiss as Horus' betrayal began and went to the Chogoris System to return to his side. While in the Warp on the way to Chondax, Yesugei's voidship encountered a Sons of Horus vessel which turned out to have been captured by surviving Loyalists of the Drop Site Massacre. Learning of the start of the Heresy from the Salamanders Captain Xa'ven, Yesugei and his new comrades continued on to Chondax to warn Jaghatai of Horus' treachery, facing resistance from the Word Bearers along the way. Plagued by dreams of Jaghatai's death, Yesugei and the other Loyalists eventually followed Jaghatai's trail to Prospero using Yesugei's frigate Sickle's Moon along with Traitor vessels captured along the way. Yesugei directed his small fleet against the Death Guard flagship Endurance, and were saved from destruction at the Death Guard's hands only due to the intervention of Jaghatai Khan, who managed to take command of his fleet after foiling a coup by pro-Horus conspirators led by Hasik Noyan-Khan during the Second Battle of Prospero. Four Terran years later, Yesugei was one of the few White Scars who had not lost faith in victory or become demoralised during the grueling attritional war the White Scars fought against the Traitors. Yesugei still believed that a path back to Terra could be found for his Legion. That path was eventually discovered in the form of the Dark Glass void station, which Yesugei boarded in an attempt to study. However as the Battle of Catallus raged, Veil, an agent of the Navis Nobilite who had infiltrated the White Scars fleet, managed to cause the station's destruction using Vortex charges. As the station was destroyed, Yesugei attached himself to the Dark Glass' command throne and painfully sacrificed himself to use the artefact, a twin of the Golden Throne, to open a portal into the Webway. As his body disintegrated under the strain, Yesugei sent a telepathic farewell to his closest friends -- Jaghatai Khan, Ilya Ravallion, and Revuel Arvida. The portal created into the Webway allowed the White Scars Legion fleet to reach Terra in time to play a pivotal role in the defence of the Imperial Palace during the Siege of Terra.Kva - Kva, also called "He-Who-Is-Divided," was the chief Rune Priest of the Space Wolves Legion during the Great Crusade and the Horus Heresy. A senior memeber of his Legion, Kva served as the equerry and counselor to Leman Russ himself. During the Battle of the Alaxxes Nebula Kva could not bring the Wolf King out of his depression, and brought in Bjorn the Fell-Handed in an attempt to do what he could not. He later discovered and captured the Dark Angels infiltrator Ormand aboard the Space Wolves flagship Hrafnkel. Kva survived the combat in the Alaxxes Nebula and remained an important member of of Russ' Einherjar. He accompanied Russ back to Fenris, where he led the ritual at Syrtyr's Door that saw Russ' mind cast into the Warp to try and find a weakness against Horus. Kva, Bjorn, and 7 other Rune Priests took part in the ritual and while Russ was away, all were slain one by one by daemons. Bjorn was the only survivor, and he and Russ later found Kva's mangled body at the foot of the mountain.Fel Zharost - Fel Zharost was the Chief Librarian of the Night Lords Legion during the Great Crusade. Zharost remained loyal to the Emperor unlike his fellows. It is likely that Zharost ultimately became Khyron, the Night Lord who was a founding member of the Grey Knights.Vorias - Vorias was the Chief Librarian (Lectio Primus) of the World Eaters Legion during the Great Crusade and the Horus Heresy. The leader of the World Eaters hated and slowly dying Librarius Division, Vorias was one of the original members of the World Eaters from Terra when they had been known as the War Hounds. As a result of this origin, his psychic nature, and not being implanted with the Butcher's Nails since this could kill psykers, Vorias was shunned by most of his comrades. During the Shadow Crusade as Angron was transformed into a Daemon Prince of Khorne by Lorgar's sorcery, Vorias attempted to "save" his Primarch but was killed by the psychic force of Angron's rage.Aaroth Ptolemy - Aaroth Ptolemy was the first and greatest Chief Librarian of the Ultramarines Legion during the Great Crusade. Ptolemy was the founder of the great Library of Ptolemy on Macragge. In truth, by the late 41st Millennium, most of the details of his life were unknown to the Ultramarines of that era. For instance, he was known to have been present at the trial of Magnus the Red, likely a reference to the Council of Nikaea, but it is unknown if he was an accuser or defender.Dio Promus - Dio Promus was a Chief Librarian of the Ultramarines Legion during the Great Crusade. He voted in favor of keeping a Legion Librarius during the Council of Nikaea. He was later recruited into the Knights-Errant. As a member of the Knights-Errant, Promus was tasked by Malcador the Sigillite with selecting candidates for the Titan Project, the eventual founding of the Grey Knights, and killing those who were seen as too mentally weak to serve in the new force of psychic Space Marines. Promus led a mission at the orders of Malcador to recover the psychic shards of Magnus the Red's soul. Accompanied by Yasu Nagasena and Space Wolves led by Bodvar Bjarki, their mission brought them to the worlds of Kamiti Sona, Aghoru, and finally Nikaea against the Thousand Sons Cabal of Ahriman. On Nikaea, Promus was struck down trying to fight a shard of Magnus, but Yasu Nagasena stepped in to protect him from a swarm of daemons. After the shards of Magnus merged and left for the Planet of the Sorcerers, Promus was confronted by Bjarki who learned of his past murders of Loyalist Legionaries at Malcador's direction from the daemon Fatewoven. Promus admitted the daemon's claims were true to Bjarki but refused to explain the secrets he was bound to keep. On the orders of Bjarki, Svafnir Rackwulf ended his life. Promus' friend Lemuel Gaumon then took his name as his own to honour his sacrifice.Quor Vondar - Quor Vondar was the Chief Librarian of the Word Bearers Legion during the Horus Heresy and became a Chaos Sorcerer who fought at the Drop Site Massacre.Umojen - Umojen was the Chief Librarian of the Salamanders Legion during the Great Crusade. He voted in favor of maintaining a Legion Librarius during the Council of Nikaea. Later, he became one of Malcador the Sigillite's Knights-Errant.Balsar Kurthuri - Balsar Kurthuri was originally a Librarian of the Raven Guard Legion during the Great Crusade. After the edicts of the Council of Nikaea forbidding the use of psykers in the Legiones Astartes, Kurthuri was forced become just another line Legionary, though he was one of the few among the Raven Guard to survive the Drop Site Massacre. Afterwards, Balsar was chosen to become his depleted Legion's Chief Librarian when his Primarch Corvus Corax reinstated the Raven Guard's Librarius to deal with the unnatural threat of the Horus Heresy. In the later years of the Heresy, Balsar's standing within the Legion would change again after a meeting with his fellow Librarian Fara Tek. Tek had returned to his Legion in the Rosario System and shared with Balsar a telepathic message he had received. Though the message was unclear, Balsar gathered from it that the Primarch Leman Russ' life was in danger. Tek could not tell Balsar where the message had come from, though he had been able to receive another message from a nearby Space Wolves Strike Cruiser that was being attacked by the Word Bearers and needed aid. Balsar immediately brought this information to Corax, who dispatched Captain Agapito Nev and the Battle Barge Providence to save the Space Wolves vessel. Agapito succeeded and brought the Strike Cruiser's commander, Rathvin, to meet with Corax. The Space Wolf informed the Raven Guard's Primarch that Leman Russ was indeed in danger, as his Legion had been cornered on the world of Yarant III by Horus' forces, who heavily outnumbered the Space Wolves. Rathvin left to join his his Legion in battle and Corax gathered his commanders and informed them the Raven Guard were going to Yarant III to aid the Space Wolves. Balsar was shocked when his Primarch informed him that he would not be joining them and that he had also been stripped of his title of Chief Librarian. Corax had once again disbanded the Raven Guard's Librarius. For reasons unknown to Balsar, Corax had grown deeply mistrustful of psykers and wanted his former Librarians to be immediately separated from his Legion and sent to Terra. Though Balsar was eventually able to convince his Primarch to let his fellow psykers remain with the Legion as long as they remained bound by the Edicts of Nikaea, the former Chief Librarian's fate was sealed. Corax commanded him to depart for Terra at once and told Balsar that when he arrived there, he was to present himself to Malcador the Sigillite. When Kurthuri arrived in the Sol System, accompanied by Captain Noriz and his Imperial Fists and Arcatus and his Custodians, the Custodian Ludivicus gave the order to hunt the Librarian down. Arcatus immediately obeyed, attacking Kurthuri on the bridge, but Noriz attempted to help him escape the vessel. Cornered by Arcatus, Noriz was killed by the Custodian, but Kurthuri was spared when he refused to use his psychic powers even to avenge the captain's death, for to do so would be to violate his oath to never use them. Kurthuri was brought before Malcador the Sigillite and presented with a suit of grey Power Armour by Umojen, himself the former Chief Librarian of the Salamanders, and became one of the Sigillite's Knights-Errant. It is possible that Balsar Kurthuri became Ogen, one of the founding members of the Grey Knights.