Going back in time has some benefits. You can find out how things got to happen on first row seat. Such is the case in Caverns of Time: Old Hillsbrad instance.  As soon as you enter the Southshore Inn, the Origin of the Ashbringer event script is played.  Commander Mograine invoked a meeting with his friends to reveal a secret … an artifact under his possession was retrieved from Blackrock Spire during the Second War. With it he plans to destroy the undead. His friends: Tirion Fordring, Fairbanks, Abbendis, Isillien, and Arcanist Doan gasp in awe at the sight of the artifact. To read the fulll transcript of the event go here.