In
World of Warcraft: Wrath of the Lich King, in a quest in the
Frostmourne Cavern in the
Dragonblight, players can see a flashback of the interaction between Arthas and Muradin prior to Arthas claiming Frostmourne. It turns out that Muradin was not slain when the ice encasing Frostmourne shattered, but was merely wounded. A short time after Arthas left, Muradin awoke. Confused, hurt, and with total amnesia, he wandered out into the snow.
Muradin was eventually tracked down by a group of
Frostborn dwarves, who followed his trail of blood-soaked snow during an extremely harsh blizzard. These Frostborn just happened to be on their way home to
Frosthold from a trek across the Dragonblight. Not about to let their new-found cousin freeze to death, they took him along with them, and a short time later they came under attack by a
jormungar. After slaying the worm single-handedly and saving the dwarves, they took him in and gave him the name
Yorg Stormheart, after a Frostborn warrior of legend.
NOTE: after a long quest chain, Muradin is reunited with both Brann and Magni, and recalls his lost memories. He then leaves the frost dwarves to hunt down Arthas. the game then Phazes, causing Muradin to be replaced by another frost dwarf.