I've mentioned this before (a couple of years ago I think), but there is a dialogue between Pitchwife and Linden in TOT in which he relates the Elohim's cosmology and their conception of the role of the Worm of the World's End in the periodic creation, destruction and recreation of the cosmos. This may contain some important pointers to the climax of
The Last Dark.
The text is as follows:
'Chosen," Pitchwife murmured, "have you heard the name of the Worm of the World's End?" She shook her head. Well, no matter." A gleam of quickening interest ran along his tone-a love for stories.
Galewrath's rhythm continued, complex and unvarying. As it thudded flatly into the dead air and the rising heat and the ea, it took on a plaintive cast, like a keening of loneliness, a call for companionship. Her arms rose and fell tirelessly.
"It is said among the Elohim, whose knowledge is wonderous, and difficult of contradiction"- Pitchwife conveyed a chortle of personal amusement-"that in the ancient and eternal youth of the cosmos, long ere the Earth came to occupy its place, the stars were as thick as sand throughout all the heavens. Where now we see multitudes of bright beings were formerly multitudes of multitudes, so that the cosmos was an ocean of stars from shore to shore, and the great depth of their present solitude was unknown to them-a sorrow which they could not have comprehended. They were the living peoples of the heavens, as unlike to us as gods. Grand and warm in their bright loveliness, they danced to music of their own making and were content."
A rustle went through the Giants watching from the foremast, then subsided. Their keen sight had picked out something in the distance; but it had vanished.
"But far away across the heavens lived a being of another kind. The Worm. For ages it slumbered in peace-but when it awakened, as it awakens at the dawn of each new eon, it was afflicted with a ravenous hunger. Every creation contains destruction, as life contains death, and the Worm was destruction. Driven by its immense lust, it began to devour stars.
"Perhaps this Worm was not large among the stars, but its emptiness was large beyond measure, and it roamed the heavens, consuming whole seas of brightness, cutting great swaths of loneliness across the firmament. Writhing along the ages, avid and insatiable, it fed on all that lay within its reach, until the heavens became as sparsely peopled as a desert."
As Linden listened, she tasted some of the reasons behind the Giants' love of stories. Pitchwife's soft narration wove a thread of meaning into the becalmed sky and the Sea. Such tales made the world comprehensible. The mood of his telling was sad; but its sadness did no harm.
"Yet the devoured stars were beings as unlike to us as gods, and no Worm or doom could consume their power without cost. Having fed hugely, the Worm became listless and gravid. Though it could not sleep, for the eon's end of its slumber had not come, it felt a whelming desire for rest. Therefore it curled its tail about itself and sank into quiescence.
"And while the Worm rested, the power of the stars wrought within it. From its skin grew excrescences of stone and soil, water and air, and these growths multiplied upon themselves and multiplied until the very Earth beneath our feet took form. Still the power of the stars wrought, but now it gave shape to the surface of the Earth, forging the seas and the land. And then was brought forth life upon the Earth. Thus were born all the peoples of the Earth, the beasts of the land, the creatures of the deep-all the forests and greenswards from pole to pole. And thus from destruction came forth creation, as death gives rise to life.
"Therefore, Chosen," said Pitchwife firmly, "we live, and strive, and seek to define the sense of our being. And it is good, for though we compose a scant blink across the eyes of eternity, yet while the blink lasts we choose what we will, create what we may, and share ourselves with each other as the stars did ere they were bereaved. But it must pass. The Worm does not slumber. It merely rests. And the time must come when it is roused, or rouses itself. Then it will slough off this skin of rock and water to pursue its hunger across the cosmos until eon's end and slumber. For that reason, it is named the Worm of the World's End."