Ahn'Qiraj is a raid that is notorious for its epic quest series that opens the gates, a project that involves the two factions and the wow classic gold whole server. That's big enough to overshadow the notoriety of this raid boss, the Old God C'Thun. Where they appeared, in expansions, the Old Gods played with a part in the gameplay then they did in vanilla. 

That was also the god imprisoned in Darkshore and there was a persistent rumor of one healer under Tirisfal Glades, but C'Thun was the only Old God that we challenged and saw in person, and it occurred at the conclusion of the raid.

Moira Bronzebeard decided to stay in Blackrock Depths once you murdered her husband, and direct the Dark Iron Dwarves. Her first movement, launch them from Ragnaros' Battle, but how to do that without risking the lives of her people? How about we start a rumor about all the fat purple loot Ragnaros allow those greedy adventurers that killed her husband manage the problem and is sitting on? According to the lore, that is what Moira did, not just to take her revenge on us but also to conserve the Dark Irons.

If you are Alliance, the narrative of the buy classic wow gold struggle with Onyxia and the raid on Blackwing Lair starts with the lore connected Deadmines, to some non invasive dungeon. One of the final links in the pursuit series for Onyxia attunement is called"The fantastic Masquerade" if you find out the noblewoman, Lady Prestor, who acts as a guide and advisor to the young King, is actually Onyxia at disguise.