Morgan

Birth
Morgan was born to a family of assassins in England, to Uther and Igraine, as the younger sister of King Arthur. Unlike her brother, she continued her career as an assassin, until he, as king, destroyed all of the assassination families, including Morgan and Arthur's parents.

Magecraft
Morgan, being the last assassin alive in England, seeked revenge against Arthur and to destroy his kingdom. Using her sheer rage and hatred, she was able to make a contract with several demons to give herself extreme dark powers, giving her magical powers surpassing even Merlin. She also wielded her own copy of Carnwennan Using her abilities she spied on and repeatedly attempted to sabotage the Round Table.

Revenge
Using her magic, she was able to convince Sir Mordred and Sir Agravain that they were in fact her sons, and were put as spies. She sent a false letter to King Arthur calling him away to Avalon. She then used her "sons" to betray the Round Table while Arthur was away, and launched her attack on the Round Table. She began with Merlin, but Merlin was able to escape, destroying her left arm in the process. She proceeded to attack the knights, and was able to kill all of them with the help of Sir Mordred and Sir Agravain, but was killed by Gawain. As she perished, she gave the order to Agravain and Mordred to kill Arthur at Camlann.