The character who speaks to Necron prior to the final battle depends on who is in the party as well as who has priority over whom. It is possible that Hades represented the final culmination of the many eye motifs observed throughout the game, seen largely displayed on structures of Terran design. There are also blinking eyes on the interior walls of the colosseum-like arena where Necron is fought. Hades was relegated to an optional boss in the final game, but appears with an eye within his sword and numerous prominent eyes peering from his throne. The concept artwork at right of the final battlefield shows the party fighting Hades instead of Necron. Hades was originally planned to be the final boss, but was changed to an optional boss. In Final Fantasy 20th Anniversary Ultimania - File 1: Character Book, Necron is described as, "a being awakened by Kuja's fear, despair, and hatred, which called out to it as he learned of his mortality, just as his ambitions were within reach".
The being pledges that it will always exist, as long as there is life and death. Kuja uses the last of his powers to teleport Zidane and his friends back to the Iifa Tree, and as Necron dissipates, it is shocked to find the strength of those who have the will to live. Though Necron utilizes a plethora of destructive magic, it is defeated. It teleports the heroes to a coliseum-like structure and engages them in battle. Necron resolves to destroy the crystal, the origin of life, and thus revert everything to a " zero world" of perpetual nothingness, an existence that would be without the fear of death. The entity announces that by observing Kuja's murderous actions it has concluded all life exists to seek death. When Zidane awakens on the Hill of Despair, he is greeted by Necron's voice emanating from rays of light above the hill. As Necron represents death itself, it states it will always exist as long as there is life in the universe. Necron is neutral and does not hate living beings, but considers the Zero World a release all living beings seek, and itself benevolent for offering it. Necron wants to fulfill what it perceives to be mankind's yearning for death. Its arm-like limbs taper off into two tentacles with stingers at the ends and it has large wing-like protrusions although Necron hovers, the wings appear ornamental. Necron's torso appears like without skin, its muscles being pronounced. Its face looks like it is covered by a mask that has holes and a mouth.
It has a glowing pale blue skin that may be intended to look crystalline. Necron is an otherworldly being with a humanoid torso. 5.1 Theatrhythm Final Fantasy Curtain Call.