Archmage Timear in Dalaran has foreseen that you must slay 4 Infinite Agents.
The timeline is in danger from the Infinite dragonflight. Without your intervention, all of time will unravel!
You must travel to a point in time known as the Culling of Stratholme within the Caverns of Time.
It gives me a migraine just to attempt to see into all of the possible pasts, but I do know that it is crucial for you to kill the Infinite agents.
Only by slaying them will the true past be preserved and the present and future kept from being undone forever!