Master of Elixirs

I've devoted my life to perfecting my elixirs. Despite my success, I haven't been able to create an elixir of eternal life. I think I know the reagent I'm missing. I've heard of a place called the Caverns of Time in Azeroth where intruders known as rift lords and rift keepers phase in and out of the timeline. This intrusive time-shifting creates tears in time itself, twisting it infinitely into crystallized essences. Bring these to me along with samples of your work and I'll teach you all I know.