“Ten thousand years in the past, the night elven capital city of Zin-Azshari was a magnificent, sparkling metropolis. Situated on the shores of the Well of Eternity, Zin-Azshari was where the aristocratic Highborne first opened a portal into the Twisting Nether and invited the Burning Legion to invade Azeroth.”
(source)
where is this?
Well of Eternity, where you fight Peroth’arn (first of the fel-touched.)