Quote Originally Posted by FF9 Game Script
Zidane: "U-Ugh... What happened to the crystal...? ...Where is this?"

Voice: "You stand before the final dimension, and I am the darkness
of eternity..."


Zidane: "Wh-Who are you!?"

Voice: "All life bears death from birth. Life fears death, but lives
only to die. It starts with anxiety. Anxiety becomes fear. Fear
leads to anger...anger leads to hate...hate leads to suffering...
The only cure for this fear is total destruction. Kuja was a
victim of his own fear. He concluded he could only save himself
by destroying the origin of all things--the crystal."

Zidane: "What the heck are you talking about? Why are you telling me
all this?"

Voice: "...Now, the theory is undeniable. Kuja's actions prove it. All
things live to perish. At last, life has uncovered this truth.
Now, it is time to end this world."

Zidane: "Wh-What do you mean by that?"

Voice: "I exist for one purpose... To return everything back to the
zero world, where there is no life and no crystal to give life.
In a world of nothing, fear does not exist. This is the world
that all life desires."


Zidane: "Who the hell do you think you are!? You're not ending anything!
Never, not as long as we have the will to live!"

Voice: "Foolish creature... Your fears have already deluded you. One
day, you will choose destruction over existence, as Kuja did.
When he sought to destroy the crystal, the purpose of life ended.
Now, come... Enter the zero world that you desire."

Zidane: "No! We'll destroy you and prove you wrong! And through our
memories, future generations will see that we can overcome any
fear! ...We can't give up now. ...We have to fight together.
Even if we lose, it doesn't matter... Our memories will live
on inside others. So, even if we are born to die, I'm not
afraid. I'm gonna live!"
Basically, Necron is some sort of entity that exists to destroy everything.