|Map||Basic Data||Planetary Image|
|Class:||Adeptus Astartes Homeworld|
|Tithe Grade:||Adeptus Non|
Medusa is a harsh realm of perpetual gloom, located extremely close to the Eye of Terror. With a dark and polluted sky, Medusa's sun rarely shines on the planet's surface and the world's geology is highly unstable, with earthquakes and volcanic eruptions constantly creating and destroying mountain ranges and seas. The people of Medusa are hardy and flourish despite the hostile environment. The population is broken up into clans who viciously compete and vie for natural resources and safe ground, as the unpredictable nature of Medusa's landscape means little can built in one place for long, save a few areas of relative calm which are mostly reserved for the Iron Hands Chapter. As the nomadic clans seek a new settlement, great caterpillar-like mining haulers carry their personal possessions and resources.
During the 13th Black Crusade of Abaddon the Despoiler, Medusa would come under massive invasion from Chaos forces. The ensuing clash saw the largest tank battle in the Imperium since the Horus Heresy.