Chromie, at the top of Wyrmrest Temple, has asked you to travel once more to the Bronze Dragonshrine. Once inside, place the Hourglass of Eternity on the ground and help your Past Self to protect it from the forces of the Infinite Dragonflight.
There you are! Or, were we just talking?
<Chromie muses over the temporal possibilities.>
Anyway, the Infinites are after you! Well, not you per-se. Rather, they're after the past version of you that defended the Hourglass of Eternity. You remember, right?
That was you back then, except it's you now too. Wait, that's not important. What is important is that you head back to the Bronze Dragonshrine and defend yourself and the hourglass from their attacks before you get erased from history!