Originally Posted by
Varodoc
Never meant anything? Il'gynoth's whispers from Legion retroactively foreshadowed all of BFA.
To find him, drown yourself in the circle of stars. -> N'Zoth's prison is literally called "Circle of Stars" and is underwater, near Azshara's Eternal Palace.
The king of diamonds has been made a pawn. -> Azshara reiterates this in the Eternal Palace. Magni, the Dwarf king that was turned into diamond, was tricked by N'Zoth. He had the champions fill the Heart of Azeroth with azerite, thinking that it would heal the planet, while in reality it was the key to unlock N'Zoth's prison.
Her heart is a crater, and we have filled it. -> The Heart of Azeroth, filled by the Old God's manipulations of Magni.
Five keys to open our way. Five torches to light our path. -> The Five Pillars of Creation were the key to saving Azeroth from the Legion invasion, which benefit N'Zoth too. If Sargeras won, N'Zoth would have been finished like the Old God at Telogrus Rift.
The lord of ravens will turn the key. -> Khadgar, the mage who can turn into raven, delivered the final Pillar required to seal the Fel breach.
At the hour of her third death, she will usher in our coming. -> Azshara, who first died when she drowned, then the elf died (metaphorical death) and the naga was born, and then had her last breath at the end of the raid fight, which is precisely when N'Zoth was freed.
Its surface blazes bright, masking shadows below. -> The Heart of Azeroth, its surfaces blazes bright, but it hides the fact that N'Zoth was using that artefact to free himself.
Literally, Il'gynoth, in Legion, spoiled BfA. How N'Zoth benefit from the Pillars ending the Legion invasion, how Magni was tricked by N'Zoth, how the Heart of Azeroth was actually used to free N'Zoth and not to heal the planet, how Azshara would die but free N'Zoth with her last breath...