Tauren

Tauren is the leader of a renegade faction of sorcerers sworn to end Uther's reign. Tauren is a warrior and warlock weilding a sword and clad in chain mail and black robes; he also possesses the mage stone, which has the power of transmutation. With this he performs what alchemists dream of - making gold. All his reason is to end Uther's life.

Biography
When we meet him he is using Tom's forge where he is seen turning lead to gold and promises Tom rewards; though Tom objects to using magic Arthur discovers the situation and arrests Tom while Tauren escapes. Tom attempting to escape is killed leaving Gwen without a father and Morgana furious with Uther.

However this is not the last we see of Tauren, as he accidentally left the mage stone at the forge when escaping. The stone's magic is strong enough to disturb Merlin. Tauren wants to meet Gwen to get it back but Morgana poses as her handmaiden and returns the stone to Tauren, agreeing to help him kill Uther in her fury over Tom's death and her imprisonment.

Morgana leads Uther into an ambush but Merlin uses the magic of the Sidhe staff. Tauren uses the mage stone to reflect Merlin's killing magic at him, but Merlin seems to have a natural resistance to magic and although it knocks him out he does not die. Morgana saves Uther, regretting her decision, and kills Tauren.

Personality
Though he was a sorcerer, Tauren did not appear to be a bad person expressing regret at the death of Guinevere's father Tom. He treated Morgana politely, calling her "My Lady" and even though he threatened to kill her when they first met he agreed to allow her to help him bring down Uther. Taurin was initially suspicious of Morgana and unsure if she would remain loyal to him. His doubts about her loyalty turned out to be correct though Morgana gave him no time to save himself when she killed him.