Prodigal Sons

Prodigal Sons
Battle Cry	Unknown
Founding	Sometime in the 32nd millenium
Successors of	Thousand Sons
Primarch	Magnus the Red
Homeworld	Formerly Prospero, now assumed to be fleet-based
Strength	unknown, presumably small (smaller still if you don't count the rubrics)
Specialty	Being space warlocks, finding hidden caches of eldar knowledge
Colours	Blue and Gold, same as the Thousand Sons

The Prodigal Sons are Ahzek Ahriman's Thousand Sons warband that was formed after he was exiled by Magnus for the massive amount of Just as planned that was the Rubric of Ahriman. Currently presumed to be trying to find a way into the black library

The Traitor Legions and Warbands of Chaos
Chaos Legions:	Alpha Legion - Black Legion - Death Guard Emperor's Children - Iron Warriors - Night Lords Thousand Sons - Word Bearers - World Eaters
Legion Offshoots:	Apostles of Contagion - Bloodborn - Broken Aquila Foresworn - Mouldering Claw - Plague Fleet - Prodigal Sons The Consortium - Warband of Subsector Aurelia
Fallen Chapters (Including Judged):	Adharon's Reavers - Blood Gorgons - Company of Misery Corpus Brethren - Crimson Slaughter - Deathmongers Death Shadows - Invocators - Lords of Decay Oracles of Change - Red Corsairs - Shriven The Brazen Beasts - The Flawless Host - The Scourged Skyrar's Dark Wolves - Steel Cobras - Voidrippers
Unknown/ Other:	Apostles of Minthras - Claws of Lorek - Disciples of Destruction Dragon Warriors - Extinction Angels - Hakanor's Reavers - Punishers The Cleaved - The Purge - The Pyre - Sons of Malice - Sons of Vengeance The Reborn - Violators - Warp Ghosts - Bleak Brotherhood