The Emperor's Children were the 3rd Legion of the Space Marines.
Their armour is purple with gold trim. The Primarch of the Emperor's
Children was Fulgrim. Their homeworld was Chemos before it was
destroyed by the Imperium.
The Preheresy Emblem of the Emperor's Children
All the First Founding Legions were created to take part in
Imperial Crusades. It was, however, nearly sixty years before the
Emperor's Children saw action. An accident during gene-seeding almost
destroyed the Legion as it was born. Once the Emperor's Children had
been re-established with rescued gene-seed they proved to be loyal
and efficient, distinguishing themselves in several campaigns.
The Emperor's Children were among the units assigned to crush Horus
and his rebel Chapters on Istvaan V. During a parley the Legion's
Primarch, Fulgrim and his highest ranking officers were corrupted by
the decadent pastimes that Horus and his Chaos-worshippers offered.
Drugged, pleasured beyond endurance, and finally broken, they agreed
to aid Horus. The rot quickly spread to the whole Legion, and the
Emperor's Children willingly embraced Chaos in all its indolent
depravity. The Imperial Cult was quickly supplanted by the more
gratifying worship of Slaanesh.
As one of the Traitor Legions, the Emperor's Children invaded Earth,
but took little part in the fighting around the Imperial Palace.
Simple pleasures had given way to complex debaucheries. While their
allies fought and died the Emperor's Children slaughtered more than
a million people and rendered them down to create endless varieties
of drugs and stimulants. Countless thousands more died to give the
Emperor's Children more direct, if cruder, enjoyment.
When the assault failed the Emperor's Children fled into the Eye of
Terror with the rest of the Traitor Legions. They were the first to
begin raiding Imperial worlds for captives and plunder. Their
excesses soon knew no bounds and simple raiding could not supply
enough raw human material for their orgies of worship. At this point
the Emperor's Children turned on the slaves and servants of the
other Traitor Legions, an action which began a series of wars within
the Eye of Terror. The struggles of the Emperor's Children continued
until the destruction of the cloned Horus by the Black Legion.
While corrupt beyond human comprehension, the Emperor's Children are
a savage fighting force. Like many of Slaanesh's followers they have
become what are known as Noise Marines. These crazed followers of
the Lord of Pleasure have become depraved and totally decadent
warriors who seek and find a perverse enjoyment in battle. The danger
of combat is a rediscovered thrill and aphrodisiac, allowing them to
reach new extremes of debauchery. The louder and more discordant the
noise the more extreme the emotional reaction provoked, until only
the din of battle and terrified screams of the enemy can stir them.
To further enhance their enjoyment Noise Marines carry outlandish
weapons that produce deafening loud and pyrotechnically explosive
attacks.
Because the senses of the Emperor's Children have become so
distorted only the most extravagant colours and patterns register on
their minds. Each suit of armour, every bolter or chainsword, is
worked into fantastic patterns and coloured in praise of Slaanesh.
Each Emperor's Children Space Marine alters and changes his armour
slightly, adding to its quality and 'beautifying' it. For the most
favoured, the weaponsmiths of the Legion sometimes carve scenes of
debauchery into shoulder and breast plates.
Taken from Codex: Chaos v2
The Emperor's Children were among the units assigned to crush Horus and his rebel Chapters on Istvaan V. During a parley the legion's Primarch, Fulgrim and his highest ranking officers were corrupted by the decadent pasttimes that Horus and his Chaos worshippers offered. Drugged, pleasured beyond endurance and finally broken, they agreed to aid Horus. The rot quickly spread to the whole legion and the Emperor's Children willingly embraced Chaos in all its indolent depravity. The Imperial Cult was quickly supplanted by the more gratifying worship of Slaanesh.
As one of the Traitor Legions, the Emperor's Children invaded Earth, but took little part in the actual fighting around the Imperial Palace. When the assault failed, the Emperor's Children fled into the Eye of Terror with the rest of the Traitor Legions. They were the first to begin raiding Imperial worlds for captives and plunder. Their excesses soon knew no bounds and simple raiding could not supply enough raw human material for their orgies of worship. At this point it appears that the Emperor's Children turned on the slaves abd servants of the other Traitor Legions, an action which began a series of bloody wars within the Eye of Terror. If there was indeed a civil war, it now seems to have been resolved or, at least, temporarily forgotten, for there have been proven cases of warriors of the Emperor's Children legion taking part in joint raids on the Imperium during the last several millennia. Taken from Codex: Chaos Space Marines v3
The Primarch of the Emperor's Children
The Daemon Prince Fulgrim
The Emperors Children Space Marine Legion was dispatched to pacify the rebel Warmaster Horus at the start of the Heresy, before the Emperor knew the full scale of Horus's abomination. At first Fulgim, Primarch of the Emperors Children, tried to negotiate with the Warmaster and dissuade him from his rebellion. While they parleyed Fulgrim was corrupted by the Warmaster. A tendril of power from the Chaos God Slaanesh insinuated itself into Fulgrim's mind and began to slowly bend him to the will of the Lord of Pleasure. Fulgrim resisted staunchly at first but little by little his fortitude was eroded away as his enhanced senses were stimulated beyond endurance and whispered promises awoke unspoken desires. Eventually Fulgrim's mighty will was broken and he joined Horus, surrendering to the hedonistic pleasures of Slaanesh. As Fulgrim delved deeper into depravity the Emperors Children followed him into heresy.
In the war against the Imperium Fulgrim led the Emperors Children in an orgy of destruction against the undefended civilian populations of a dozen systems, slaughtering and enslaving millions in pursuit of their pleasures. When the Warmaster was slain by the Emperor, Fulgrim fled to the Eye of Terror with the remaining Emperors Children.
Centuries of worship have changed Fulgrim beyond all recognition. Serpent bodied and many armed, Fulgrim has been twisted into a monstrous daemonic creature. Despite his monstrous appearance Fulgrim radiates a strange beauty and physical attraction, captivating and transfixing all who encounter him. Clouds of pastel coloured soporific musk billow around Fulgrim wherever he goes, weakening the will and awakening disturbing desires in those who breathe the heady musk. Taken from Renegades