Originally Posted by
Utigarde
Okay, if I need to break it down patch by patch for you I will. 7.0, premise of the expansion around a massive portal to Argus above the Tomb, sparks central conflict between Alliance and Horde, and on the Broken Isles. 7.1, portal in Karazhan to Argus, we shut it down and learn more about Medivh's status, who hints about us needing to go to Argus to settle things. 7.1.5, Nighthold, entire premise is Gul'dan opening a portal to Argus to put Sargeras' soul into Illidan's body, Illidan, upon returning, says we must follow him into the abyss (hint: Argus). 7.2, we return to the Tomb to shut the massive portal to Argus, and in the final boss fight, actually go to the skies above Argus, where Illidan opens a portal that puts Argus directly in Azeroth's orbit. 7.3, a patch based entirely on Argus, where we stop the Legion and defeat Argus' world soul.
Not sure how much more obvious you can get. And if we want to go into detail on Sargeras, the real end boss, lore wise, he's been talked about the entire expansion. Hell, he's featured in 7.2's trailer.