<P> Merlin was eventually able to destroy the creature and the gargoyles, revealing himself as a sorcerer to Sigan . Sigan attempted to convince Merlin to join forces with him, tempting him with promises that they would rule Camelot together and that Arthur would "tremble at Merlin's feet", but Merlin refused . Sigan then tried to possess him, but Merlin was able to imprison Sigan's soul back in the jewel with the help of a spell given to him by the Great Dragon . The jewel and Sigan's treasure were subsequently returned to the burial chamber and sealed off . </P> <P> The Dolma (portrayed by Colin Morgan) is one of two characters who Merlin uses as a disguise (the other is Dragoon The Great). She appears only once, in Series 5's episode "With All My Heart", after Queen Guinevere is possessed by a spell cast by Morgana . In order that the spell be broken, Guinevere must bathe in an enchanted lake . Due to the nature of the spell, she must enter of her own free will . King Arthur therefore must persuade her in . Due to Arthur's essential role and the requirement that there be a sorcerer on hand to break the spell once Guinevere is in position, Gaius informs Arthur that he has found a woman to perform the task . Merlin therefore assumes the role of The Dolma, an elderly, reclusive sorceress who has trouble getting clothes and who is the alleged guardian of the lake . This "difficulty in getting clothes" is the cover that Merlin needs to bring a dress with him to change into it when they arrive at the lake . </P> <P> The Dolma's most memorable line is, "Nothing is hidden from...The Dolma!". She also refers to Merlin as "the gangly boy" and uses him as surety to ensure that Arthur does not attempt to kill her for practicing magic . </P> <P> The Great Dragoon is one of the two characters whom Merlin uses as a disguise (the other being The Dolma). Merlin transforms himself into Dragoon by means of an aging spell, usually when he wishes to carry out a plan in which it is essential that he is not recognised . Dragoon is a very cantankerous old man and frequently says all of the things that Merlin would love to say himself, but wouldn't dare . He also allows Merlin to use his magic more openly than he can as himself . Dragoon is technically an enemy of Camelot, but has more than once allied with Prince Arthur in order to fulfill a plan . Given that Merlin made up the name on the spot, there is speculation that he based it on a variation of "The Great Dragon" (Kilgarrah). </P>

When does morgana find out she has magic