Thanks to imlistening123 and OZONE_TempuS for the inspiration!
According to the Hades (Final Fantasy IX) article on Final Fantasy Wikia:
Hades, originally introduced to the player as a Mysterious Voice, is a superboss in Final Fantasy IX. He is encountered in Memoria in the ocean room by walking right and examining the area behind the large rock and choosing not to leave when asked. There will be no “?” field icon to indicate him, but pressing reveals him. Instead of the the normal boss music, “Hunter’s Chance” plays during the fight.
Here’s a picture of Hades’ arena.:
Hades is the Greek god of the Underworld, as well as the name for the Underworld itself. This fits into the concept of Life and Death in Final Fantasy IX story. They even hint at a god of death in the game. Even Hades’ move, Doomsday, seems appropriate.
And then, there’s this quote:
You stand before the final dimension, and I am the darkness of eternity…
All life bears death from birth.
Life fears death, but lives only to die.
But all references pointing to Hades’ involvement in the world made way for Necron’s complete “surprise”. Why? Hades a representation of death and judgment on the throne. Necron looks like a caduceus, an ancient astrological symbol of commerce and is the protector of merchants and thieves. Why wasn’t he the icon for Zidane?
From a literary standpoint, Necron is worst than a Deus Ex machina. He makes the plot more complex, keeps things unresolved, and provides a further challenge. Why don’t we keep adding final bosses then? I understand Necron’s thematic elements within the game. But Necron comes out of nowhere to us because we weren’t previously informed of his existence throughout the story. That’s terrible writing. Necron may not be an actual Deus Ex Machina, but consider this:
In the characters too, exactly as in the structure of the incidents, [the poet] ought always to seek what is either necessary or probable, so that it is either necessary or probable that a person of such-and-such a sort say or do things of the same sort, and it is either necessary or probable that this [incident] happen after that one. It is obvious that the solutions of plots too should come about as a result of the plot itself, and not from a contrivance…
— Poetics, Aristotle
According to Aristotle, Necron is contrived. Of course, this is Aristotle’s opinion; but it’s one that makes aesthetic sense, at least in the Western world.
Necron is the weak point in a truly great story.
Everything about Necron, from the themes to plot elements, worked with Hades.