At the far end of existence, there is a material which can best be described as inverted, or hollow. It's anti-existence. To create it, something must be removed from nothing. It cannot be destroyed or changed, because it does not exist. I may be perceived as a grey rock slab with stone carvings.

Its only quality is that of being cumulative. Everything created must be somehow added to what already exists. This serves as a record of all definite existences. If you want real immortality, your creation must be registered, carved into the grey stone. Perhaps it can be said that it's an inversion of eternal existence - eternal anti-existence.

I've been aware of certain things being registered there. Some are rather peculiar, like the moon. Yes the moon is a registered indestructible formation. When I started dealing with aliens, I realized the lyran medium sized battleship is a similar construct. I don't know if they are aware of it.

Speaking of the moon, it's a rather strange construct which travels through time and space when moving through its phases. It's not at all like people think.