u/MartechiFalkberg

By the brooding giant Ossadeen stands the house of the Dullahan, An enormous tower of metal and scrith, strung with the golden lights of moving vessels. For all years, the house is a bustling hub of local trade, merchants and scavengers from across the system coming to the grand bazaars nestled in the crevices of the vast abandoned structure.

But on every fifth turn around the sun, the seasons change and the giant looms large as the house falls ever closer to its periapsis. Then, the time has come, and from beyond the sphere of the local star, arrive the nomad engineherders of the great clades Megachaira. With carcass hulks in tow, on ships like megatropolises overgrown with machinery, the Megachaira make their home in the house of the Dullahan, and with them surge knowledge and trade, and the whole system comes alive with new riches flowing in.

It was most curious then, when in the fifth cycle since Gondwana's winter the Megachaira Nomads did not return.

For a hundred thousand years mankind has held the stars, claimed and shaped their worlds, and imbued them with technomancy.

Vast and ancient, the galactic sphere of von-Neumann machinery, arcane origin of the Noosphere Unity, the universal principle of civilization, making manifest the Light, key to an orderly universe.

In the unity's light there stands the Mechanist Union, arbiters of technology, artificers of nanomachines, conjurers of electric spirits.

Technomantic bastion of humankind, the second hyper-civilization stands entwined with the empire, locked in eternal struggle and symbiosis, as one of twin stars, masters of Gondwana.

(Stills of an animation accompanied by the text above. The full animation can be found here)