The duel between Merlin and Edwin Muirden occurred after Merlin discovered Edwin attempting to kill Gaius, who had tried to stop him from enacting his plan to avenge his parents' deaths.
Events[]
After Edwin Muirden tricked Uther into making him court physician, he enacted his plot to avenge his parents' executions by poisoning Uther and enchanting an Elanthia Beetle to devour his brain.
Gaius attempted to stop Edwin by attacking him with magic, but failed because he mispronounced the spell. Edwin cast the spell correctly and threw Gaius against the wall. He then commanded a ring of fire to surround Gaius, trapping him.
At this point, Merlin burst into the room and demanded that Edwin release Gaius. Edwin offered Merlin a place at his side once he became ruler of Camelot, then used telekinesis to throw an axe at him when he refused.
Merlin ducked and used time magic to stop the weapon, and though Edwin cast another spell to strengthen his control, Merlin's magic overpowered his and hurled the axe back at Edwin. The axe killed Edwin and his death broke the fire spell, freeing Gaius and allowing him and Merlin to save Uther (A Remedy to Cure All Ills).