He and Sefa escape but Ruadan dies a few miles out of Camelot and Sefa runs off, her current whereabouts are unknown. After Merlin, Arthur and the others returned to Camelot when Lancelot sacrificed himself to defeat the Dorocha, he and Merlin learned that Morgana was aware of Merlin’s identity as Emrys. Despite his fondness for Morgana, after the sleeping plague he was quick to believe Morgana had allied herself with Morgause. Taught me that magic should only be used for great deeds. He takes Arthur to Avalon to heal him, but the pair are attacked by Morgana a short distance away, but she is taken by surprise when Merlin kills her with Excalibur. Gaius warns his ward that the old ways are powerful where the Disir hold court so he should tread with care. Her only appearance was "Drawing of the Dark". He appeared to have sent Gaius, who was then the court sorcerer and physician, to the Isle of the Blessed to make a request on his behalf. Out of worry for his ward Gaius tells Arthur of Finna's presence in Camelot and where to find her. On the cusp of completing her plan, however, Morgause halted her assault when Merlin poisoned Morgana in order to break the sleeping spell. She was arrested for witchcraft but later released, and joyfully reunited with her father. Mordred's Sword is then forged in the breath of the White Dragon Aithusa. At the start of the Great Purge, Uther gave Gaius a list of all people who were suspected of using magic to be killed. The physician states that it was forged in Helva but other than that he knows nothing about it. Not long after, Percival swore allegiance to Arthur and aids him in the subsequent attempt to retake Camelot, stating that Arthur's enemies were his enemies. Merlin travels to the Crystal Cave to restore his power, but a traitor in Camelot reveals this to Morgana, and she seals Merlin inside. Guinevere 'comforts' Gaius after Merlin has been arrested for treachery. The Dragon subsequently flew Merlin back to the outskirts of Camelot. They share a kiss when it seems Lancelot will not return from fighting the bandits. Shortly after this he was found by Agravaine, who put a knife to his throat, but Gwaine's timely arrival foiled his plans to kill Gaius. Here Merlin reveals his magic and throws aside Agravaine and his men. The man tells Merlin of Arthur's bane which he says "stalks him like a ghost", before showing him a vision. Morgana then leads a terrifying manhunt in pursuit of the druid Finna, Alator's friend who also knows of Emrys's true identity. Knight Valiant (portrayed by Will Mellor) was a knight from the Western Isles, who came to Camelot to battle in the annual sword-fighting tournament. Most of his inaction appears to be dictated by his concern about the future; he even sided with Merlin in freeing Uther from a troll's enchantment, despite the old magical ties between the two races. Merlin is understandably drawn in by Borden's news, and promises to help him. In the physician's care Mithian soon recovers. Gaius believes that Finna is an ally of Morgana and that she has come to lure Merlin to his doom. Gaius nobly decides to offer his life of her behalf. The young warlock remains adamant Mordred must not be allowed to leave Camelot with Kara. How old a man can grow and yet change so little. But Merlin attempted to convince Gilli to withdraw from the tournament before anyone got hurt. In The Wicked Day, Odin sends The Gleeman to assassinate Arthur. Directed by Justin Molotnikov. Even without magic, Gaius has shown exceptional talent as a physician, regularly treating injuries in the court, and even preparing a draught that precisely duplicates the taste of a troll potion without any access to the original recipe. Gwaine regularly fought against Morgana's soldiers to obtain food for Gaius, whilst Elyan cared for him. Gaius then protested against the two younger men giving him food, stating that Gwaine would need all his strength to continue fighting and that it was wasted on him. Over time, sadly, her growing fear that she has magic, as well as her increasing anger towards Uther's callousness, a distance from Arthur (possibly due to his growing close to her maid), the hostility of the Great Dragon toward her (that she is unaware of) and most importantly, the unwillingness of Merlin and Gaius to tell her the truth or give her any real help in understanding or controlling what's happening to her - all of which serves to leave her feeling increasingly isolated and alone- which enables Morgause and others to corrupt and use her - eventually; following a long period of isolation with Morgause (indicated to be about a year) sees her previous compassionate views warped and Morgana become fully committed to evil. During the battle, Morgana activates the enchantment, and it momentarily seems that Arthur may lose as Annis's and Arthur's armies watch on in shock, however Arthur miraculously wins. During the Great Purge, Uther ordered many people to be drowned, including children who had inherited magic from their parents. Morgana often went to Gaius for potions that were supposed to help her with her nightmares, which were sometimes effective but more often not. When Morgana unleashed an immortal army on Camelot, Merlin asked the Dragon to take him to the Lake of Avalon to recover Excalibur to use it against the army, and the Dragon assured Merlin that he would always aid him despite his apparent distaste at being used as a 'horse'. Additionally, he has a great knowledge of sorcery and the legends associated with it, having studied and practised it for many years before the Great Purge. Merlin and Gaius managed to find the source of the disease; an Afanc in Camelot’s water supply and after the Afanc was destroyed, Gwen was freed. When Gaius and the others were eventually rescued after Arthur recaptured Camelot, Gaius was in a critical condition but soon recovered. He desired the Fisher King's kingdom to be returned to its former glory. However, the Great Purge forced them to separate and they didn't see each other for approximately twenty years. In retaliation, Odin sent a professional assassin, Myror to Camelot to attempt to kill Arthur in the episode "The Once and Future Queen". The betrayal shatters Uther's spirit and he is unable to lead the realm afterwards, so Arthur takes over with assistance from his uncle Agravaine. Gaius managed to procure an antidote, but Valiant discovered that Ewan had survived and that Merlin had discovered his scheme. Tauren (portrayed by Cal Macaninch) was a sorcerer who led a gang of renegade wizards with the aim of bringing down Uther Pendragon. Like Merlin, Gaius treats Arthur like another son that he never had, yet he did not bother to ever let Arthur know the truth of Uther's death and the necklace that was enchanted by Morgana, thus let Arthur believe that he was responsible for his own father's death. Gaius, once again you've saved my life, you've always served me well. She then fled Camelot with Morgana's unconscious body. Gaius subsequently helped Alice to escape Camelot again, the night before her scheduled execution. Gaius helped Balinor to flee Camelot and sent him to Ealdor, where he stayed for a brief time with Merlin's mother, Hunith. She instructs Agravaine to help her find and destroy Emrys. Gaius is very proud of Merlin but also frequently scolds him about his recklessness with using magic, though ultimately things usually work out for the best. Merlin later returns to her when their village is attacked by raiders. Arthur knew that magic had been used to drive the raiders away, and the dying Will took responsibility for this in order to protect Merlin. The dying sorcerer gives Arthur a coin from the Disir, interpreted as a judgement against Arthur. Despite past problems and outside interference, their relationship continues to flourish. He was killed by Sir Gwaine. In the third season, it was revealed that he had left Camelot some years previously, before the series began, and that he had not remained in touch with his family, leaving Gwen uncertain as to whether he was dead or alive. Gaius hid in the woods with Arthur, Merlin, Elyan and Gwaine. After the loss of his beloved wife, a grief-stricken Uther turned on Nimueh, accusing her of treason and banishing her from Camelot, and began the Great Purge, ordering the execution of hundreds of sorcerers, both good and evil. Due to the nature of the spell, she must enter of her own free will. He believed that the draughts, which essentially drugged her so that she could not dream, were the best treatment, and was angry when Merlin argued with him about it. (The Coming of Arthur), Arthur's demise and Queen Guinevere's mentor. Lancelot was subsequently captured and sentenced to be eaten by the wildren Hengist kept. Arthur's feelings for Gwen are once again revealed when he finds the ring he gave to her, under the influence of Merlin and admits that he still loves her. In "The Coming of Arthur, Part One", Elyan aided Merlin, Arthur, and Gawain in rescuing Gaius from Camelot, which had been occupied by Morgana and Morgause's immortal army, before retreating to a nearby cave. Gwen appears to feel guilt over Arthur's obvious reaction and hurt too because now he is denying that he has 'feelings' for her. Though he was eventually defeated, he resisted Alator's mental torture for quite a while though it is unclear if he did this through magic or willpower. Gwen to Gaius upon finding out Morgana was using dark magic. Her sudden revelation here feels too convenient. (The Sword in the Stone). Kilgharrah cared little for Gaius, stating to Merlin that he has no place in his destiny and the "old man’s" time is over anyway, when Gaius went to the Isle of the Blessed to sacrifice himself for Merlin and Hunith. Ygraine also appears in "The Tears of Uther Pendragon, Part 1" as one of Uther's hallucinations, grabbing and hanging on to Uther's arm in a well. He was devastated to see then that Gwen had discovered that she had feelings for Lancelot, who had also tried to rescue her at this time. Gaius later told Arthur that he loved him and Arthur thought of Gaius as a member of his own family having known him ever since he was born (The Secret Sharer). Edwin attacked Merlin then, but was defeated when Merlin magically returned an axe Edwin had thrown at him, hitting him in the head. When Arthur was seriously injured by the Questing Beast, Gaius did everything he could to save the prince and managed to keep him alive long enough for Merlin to go to the Isle of the Blessed to find a cure. Dragoon The Great is one of the two characters whom Merlin uses as a disguise (the other being The Dolma). The following day, Arthur led his small band into the dungeons and fought fiercely against Morgana's immortal soldiers, holding them off until Merlin was able to destroy them by emptying the Cup of Life of the blood it held. However Merlin regains his magic and warns Arthur. She turned out to be working for Morgana, and was soon executed - to the obvious pain of Gwaine. Additionally, he has a great knowledge of sorcery and the legends associated with it, having studied and practised it for many years before the Great Purge. To Merlin, Kilgharrah says that "in Albion's (United Kingdom) greatest need Arthur will rise again to fulfill his destiny", then Kilgharrah flies off and is not seen again. It is possible that Gaius died some years later as he was very old and tired. When he came to, Merlin told him that he had dealt the dragon a mortal blow, when in reality Merlin used his new status as a Dragonlord to command it to cease its attack. After another attack by the griffin, Arthur sped up Lancelot's training in order for him to join the other knights in the coming battle against the creature. Arthur Pendragon (portrayed by Bradley James) was the king of Camelot and formerly the prince. After killing Agravaine, Merlin visits the Dragon for help in assisting Arthur (devastated after the betrayal of Agravaine) in proving to himself that he can be the king that Camelot so desperately needs. However, Uther had Arthur drugged and locked him in his chambers, before taking to the field using Excaliber. 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