Quote:
(Necron): "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."
Necron, according to the dialogue, desires to return "everything" to the "zero world." Not only is this zero world a place with no life, it is also a place with no crystal. If the crystal, which gives life, disappears, then theoretically even the possibility of life also vanishes. Also, the crystal deals heavily with the idea of memory.
Quote:
Voice of Garland: You have entered a new realm. There are no more
words. There is no more space... Follow your memory, and march forth...
Zidane: Garland, what exactly is our memory!?
Voice of Garland: .........
Zidane: Why can I remember other people's experiences and events that
happened before my time?
Voice of Garland: .........
Zidane: Garland, please! Tell me!
Voice of Garland: ...Do not limit memory to just one individual's
experiences from birth. That is only the surface. Every life born into
this world, whether natural or artificial, requires a parent. And that
parent also requires a parent. Life is connected, one to another... If
you trace the root of all life, there exists one source. The same can
be said for memory. All life constitutes an intelligence that holds
memory beyond experience. Memory is not isolated within individuals. It
is an accumulation of generations of memories that continues to evolve.
You can say that memory and evolution go hand in hand. But most life-
forms do not understand the true nature of memories... ...which explains
why most memories never cross paths.
Zidane: ...So, what am I gonna find by tracing back our roots?
Voice of Garland: ...A presence that presides over all life and memories.
The crystal...
Zidane: Crystal...
There is clearly a difference between dying and having never existed. But if both life and memory are so intimately tied to the crystal, and memory is a quality that transcends individuals (for the purpose of the game), then eliminating the crystal obliterates all memory. Gven that the crystal gives tangible form to life, this effectively voids everything that had ever happened.