Welcome to the forum. Have you read TUC already?(click to show/hide)
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As H said, they might simply be built better for long life spans, but then again, we do see evidence of them losing their memories. I cannot remember which book it is, but in one of them we have Aurang musing over his past and although he can remember having been on previous worlds, he cannot actually remember being there, IIRC.(click to show/hide)
Edited: PLaced everything in a spoiler tag and rewrote the thread title. Just in case someone who hasn't discovered this information yet comes across it.
Surfaces vast and gold soared and plunged about the Inchoroi, who appeared sepia for reflected light, like something carved from an apple. He hung out from one arm, clawed feet braced against the Horn's impenetrable skin, so high his lungs ached for the the emptiness of the air. Though he had been Grafted for this world, the frame of his body remembered its distant womb, or at least held fast some portion of it. His soul, however, recalled nothing of his origin, unless solace could be called recollection. he dreamed it on occasion, especially when novelty had commanded his day, as if all those ancient experiences, hidden as they were, remained essential to his understanding. But he could never remember these dreams. He knew only that contentment hummed deep within, hanging thus, stirring him to wonder at worlds with thinner air.
We might know. Araux is still alive. Maybe the mutilated will make use of him(click to show/hide)(click to show/hide)
A fair point, unfortunately we'll likely never know.