Is it eternal, though? There seems to be an element of reincarnation in Earwa. Souls seem to be recycled into newborns (either whole or rebuilt from fragments), and it was this soul in-flow that the No-God prevent with the womb-plague.
It could be that the quest of recovering a whole soul were the Dunyain definition of a self-moving soul, which could explain their 2000-year breeding program. Incidentally the word
Holy comes from the Old English word
Hálig, which meant
Whole.
But on the other hand, what references do we have for reincarnation? I remember Cleric somehow remembering Mimara in WLW if that counts, but apart from that? The description of the Outside seems more like a demonic gore-fest than something where souls escape from in a shattered form to give life: Even in Eärwa, thousands of babies must be born on a daily basis.
Since there's no time in the Outside from your subjective view it's always eternal even if it looks like a short blip to anyone "inside".
This seems fairly reasonable to assume, although outsiders seem to
perceive the passage of time all the same. In TGO p.44-46 one of them mentions Kellhus having been in the Outside before (the
Head on a Pole passage). Of course this could be a reincarnation-thing, but that remains to be seen. I'm curious as hell about the explanation
