King Murghol

King Murghol is the leader of the Duergar faction that Vox Machina battles against during their time in the Underdark.

Background
At some point prior to Vox Machina's attack on the Emberhold, K'Varn the Beholder managed to successfully conquer the fortress and all within it. It is implied that Murghol might have surrendered to K'Varn in order to save his life and maintain his power. However, it is also possible he was promoted after K'Varn killed the original ruler of the city. He definitely held some powerful position prior to the attack.

The Throne Room
During the assault on the Throne room, Tiberius attempted to trick the Duergar within into thinking he was one of their gods. Murghol and his wife, Queen Ulara, were the only Duergar to see through the deception. During the ensuing fight, he battled against several members of Vox Machina at once in the episode The Throne Room.

Death
Murghol was killed towards the end of the battle by Scanlan, who decapitated him and tossed his head into a pool of lava.

Aftermath
Murghol was able to buy enough time for his wife to escape with a then-dominated Grog. This caused Vox Machina to speed up their journey deep into the Underdark in order to rescue their teammate.

Personality
Murghol was an incredibly fierce opponent, who showed his skill in warfare when fighting off several members of Vox Machina. He had a strong air of superiority, expecting his men to follow his every order for all the loyalty he had shown them which caused a tug-of-war in willpower between him and Tiberius during the latter's deception. He was also more intelligent than many other Duergar, seeing that Tiberius was only attempting to trick his men into lowering their guard.

Abilities
Murghol used at least one potion during combat to increase his physical strength. Most of his abilities were Natural Duergar abilities as well as various enchantments on his armor and weaponry.

Potion

 * Increase Attack Strength (presumed)