As Mount Arreat was the symbol of the Barbarian peoples in their northern lands, its destruction was a crushing blow to their cultural consciousness. In the twenty years since that grim event, the Barbarian tribes are known to have spread widely across Sanctuary, many departing their traditional homelands due to the loss of their sacred mountain.
It is said that when the world was very young the tribes of the Northern Steppes were given a sacred charge. Somewhere deep within the great mountain, Arreat, was a source of great power, crucial to the well being of all humanity. The tribes acted as guardians of this artifact, and through this sacred duty, have shaped their way of life in observance of this power. These tribes are called "Barbarians" by many in the Western Kingdoms.
Events Regarding Arreat Crater
Not much is currently known about the events surrounding Arreat Crater, however, it is thought to be of major importance in Diablo 3. It is depicted in the Cinematic Teaser, as well as on the Official Diablo 3 Website world map.
It's also known that the Mountain and Crater will be seen in a Diablo III cinematic. A view of the erupting mountain as seen in the cinematic is visible to the right.