Magnus the Red

Origin & Rediscovery

Prospero was a quiet world. It had survived the Age of Strife by walling itself off — a refuge of psykers and astronomers who had built, over the long dark, a library-city of pyramidal crystal called Tizca and an intellectual order the rest of the galaxy had largely forgotten existed. The infant pod fell on its outskirts. The community that found him recognised him immediately for what he was — they had been waiting, in some sense, for the gift of a son like this — and raised him as a prodigy among prodigies.

By adolescence he was the most powerful psyker on Prospero. By adulthood he was cyclopean — a daemon had taken his other eye in a ritual he had been too young to fully refuse, and he wore the loss as a kind of credential — and the most powerful psyker the Imperium had yet produced. When the Emperor arrived to recover him, Magnus presented himself with Tizca's library at his back as a dowry. The Emperor accepted both. The Thousand Sons that gathered to his banner were almost entirely psychically gifted, an exception the Emperor only reluctantly tolerated.

The Council of Nikaea

The Emperor convened Nikaea to settle the question of sorcery in the Astartes. Magnus argued for it. Russ argued against. The Emperor — listening to both, with thousands of witnesses present — ruled against Magnus. The Legions were to abandon their psyker-corps. The Thousand Sons were to give up the work that had defined them.

Magnus did not accept the ruling. He believed his sons would die of the flesh-change — a gene-seed instability only sorcery had been keeping at bay — and he continued the work in secret, in a private library-laboratory on Tizca, with his most senior sorcerers. The Emperor knew. The Emperor warned him. The Emperor warned him again.

The Warning

When Magnus learned of Horus's impending treason — through divination he had specifically been forbidden to use — he tried to do the right thing in the worst possible way. He cast a psychic missive through the warp directly into the Imperial Palace, intending to warn his father in time to act.

The missive arrived. It also shattered the Imperial Webway gate the Emperor had been building beneath Terra for decades — a project no surviving Imperial mind has fully reconstructed since. The Emperor's rage was incalculable.

I had to. The price was knowledge. The cost was your wrath. I accepted both.

— Attributed to Magnus, the Burning of Prospero

The Burning

The Emperor ordered Magnus brought to Terra for judgement. Horus, intercepting the order in the warp, edited it to read *raze Prospero*. Russ executed the edited order — and Magnus, sensing the wolves approaching from the upper atmosphere, made no real attempt to defend his planet. He believed he deserved punishment.

Prospero burned. The Thousand Sons died on its streets in numbers Magnus had not been ready to count. As his Legion was being annihilated around him, Magnus — dying in his own library — made the pact with Tzeentch that would have been unthinkable hours before. The Crimson King survived, and so did fragments of his Legion.

The Rubric

The flesh-change resumed in the Eye of Terror, even with Tzeentch's favour. Ahriman, Chief Librarian, cast the Rubric — a ritual designed to lock his brothers permanently against further mutation. It worked. It worked too well. Most of the Thousand Sons became dust-filled animate armour; only the senior sorcerers, including Ahriman himself, retained consciousness.

Magnus, when he understood what Ahriman had done, exiled him. The exile continues.

All is dust.

— The Rubricae, post-Ahriman

Legacy

Magnus is now a daemon primarch of Tzeentch, ruling the Planet of Sorcerers in the Eye of Terror. He continues to scheme. The Thousand Sons walk forever in their armour as dust. Ahriman seeks a way to reverse the Rubric and is not welcome in either realm. In the Era Indomitus Magnus has returned to realspace several times — most notably during the Devastation of Fenris, where the Wolves repaid old debts in coin he was not prepared to receive.