Lethe (planet)

Map	Basic Data		Planetary Image
	Name:	Lethe
	Segmentum:	Segmentum Obscurus^[1a]
	Sector:	Coronid Deeps^[1a]
	Subsector:
	System:
	Population:
	Affiliation:	Imperium^[1a]
	Class:	Industrial World,^[1a] former Adeptus Astartes Homeworld^[2]
	Tithe Grade:	Unknown,^[2] former Adeptus Non^[2]

Lethe is an Imperial Industrial World of the Coronid Deeps region of space.^[1a]

History

By the time of its discovery by the Imperial Rogue Trader Vaspperly Elgin in the Great Crusade, the world was dominated by a decayed pre-industrial civilization that had arisen during the Age of Strife. The mist-shrouded and river-filled world was used as an early staging point in the Great Crusade.^[1a] It would provide the Imperium with Solar Auxilia Regiments called the Ash Scorpions, named after the world's deadly Ash Scorpions.^[4]

By the Horus Heresy, Lethe was undeveloped and lightly populated but still home to several famous light infantry cohorts of the Imperial Army.^[1a] In the civil war, it became one of the battle sites of the Manachean War. The loyalist Death Eagles Blackshields clashed with the Emperor's Children on the planet.^[1b]

Lethe was occupied by Chaos forces during the 12th Black Crusade, but eventually liberated by the White Consuls under Captain Palatine.^[3]

At some point in late M41, Lethe became home to the Flame Falcons Space Marine Chapter before they went renegade.^[2]