Rykarth the Unbreakable is one of the Chaos Dwarf Lords of Zharr-Naggrund. He is known for his toughness and courage, which set him apart from other Chaos Dwarfs. In a race of stout-hearted and disciplined warriors, Rykarth is viewed as a paragon of Chaos Dwarfen toughness, resolve, and cunning. He has faced many powerful foes and has triumphed every time. Rykarth himself was present in the forges of Zharr-Naggrund when Archaon signed a deal for the creation and crewing of the daemonic Hellcannons. Some say that Rykarth even met eyes with the Lord of the End Times without looking away. Only moments after which Archaon agreed to pay the hefty commission demanded by the Chaos Dwarfs.

During the Nemesis War for the Nemesis Crown, he led an army in the vicinity of the Talabec Borders. He wore the Armour of Gazrakh and wielded a two-handed axe.

During the events of the End Times, Rykarth fought against Grimgor Ironhide when his forces assaulted the Chaos Dwarf Empire, he was ultimately slain by the Black Orc Warboss.