Frostmourne Cavern



Frostmourne Cavern was the cave that held the runeblade Frostmourne prior to being claimed by Arthas Menethil. The cave itself was not named until fairly recently, when the Scarlet Onslaught arrived in Northrend and found the cavern. They apparently named it after its obvious historical significance.

In the Alliance quest, players can see a flashback of the last interactions between Arthas and Muradin Bronzebeard (as originally seen in Warcraft III), with a surprise ending indicating Muradin's survival.