Planet of the Sorcerors: Deep within the violent disturbance to reaspace that is the Eye of Terror, hangs a rocky, volcanic rock known as the Planet of the Sorcerors. The very rock is suffused with magical energy; multi-coloured clouds swirl in the dark skies, rivers of strange hues and molten rock swirl on basalt flood plains and the air crackles with suppressed power.
Crags of black basalt dot the surface, and these peaks are themselves dotted with the towers and observatories of the Thousand Sons Traitor Legion. At the ending of the Horus Heresy, Magnus the Red and his followers retreated into the Warp. Their patron, Tzeentch blessed Magnus with the position of daemon-prince and gave him the Planet of Sorcerors as his new home.
The tallest and greatest Tower on the surface is the Tower of the Cyclops; an imposing black edifice where thousands of guards and servants are gathered. At the very pinnacle, the Eye of Magnus stares out into the Immaterium; scanning, watching, its great fiery orb forever scrying the strands of fate and the currents of the Warp.
Real-world reference: intentionally or otherwise, Magnus the Red's black tower with its eternally watchful Eye bears no small resemblance to Sauron's tower of Baradur in J.R.R. Tolkien's The Lord of the Rings.
Source: Codex: Chaos, 2nd Edition by various
Submitter: Simguinus
Hive World Terra