The Ag’nagaruth were not born.
They were created.
Their existence began during one of the greatest acts of slaughter ever recorded: the Battle of 463 Hereafter.
For centuries, humanity had waged an extermination war against the Niloth and Morak. Entire civilisations disappeared beneath orbital bombardment. Fleets numbering in the hundreds of thousands burned between the stars. Worlds became graveyards. Generations were born knowing nothing but war.
Then came Hereafter.
More than a million Zeus vessels converged upon the system to defend its Primary Relay Station. The Niloth and Morak answered with everything they had left.
Billions died.
The killing became so immense that something changed.
Space began to scream.
At the centre of the battlefield, where death was at its greatest concentration, reality ruptured. The boundary separating the material universe from something beyond it tore open.
And through that wound came the Ag’nagaruth.
They whispered.
At first, survivors reported voices bleeding through communication systems. Strange melodies appeared across encrypted military channels. Others heard them without equipment at all—inside sealed helmets, inside bunkers, inside their own thoughts.
The voices offered different things to different people.
The desperate listened first.
Then the frightened.
Then everyone else.
Crews turned upon one another. Officers murdered their soldiers. Captains opened airlocks and vented entire decks. Friends became enemies without warning. Some simply stopped fighting and walked willingly towards the horrors waiting for them.
The Ag’nagaruth had discovered humanity’s greatest weakness.
Humanity itself.
Their war was fought through corruption rather than occupation. They attacked thought before flesh, exploiting grief, fear, ambition, anger and despair until resistance collapsed from within.
Those who surrendered to the Whisper became something else.
Some changed slowly.
Others transformed within moments.
Bodies twisted. Minds disappeared. Identity was stripped away until the individual became little more than a vessel for demonic purpose.
From these victims came the first great hordes of the possessed—creatures humanity would later classify as Husks, Striders, and countless increasingly specialised mutations.
Every population became potential reinforcement.
Every battlefield fed the enemy.
Every casualty risked returning.
Traditional military doctrine became almost meaningless. A soldier killed beside you might rise against you. A refugee vessel might carry corruption into an untouched system. An entire battalion could fall without the enemy firing a single weapon.
The Ag’nagaruth did not need to defeat humanity’s armies.
They only needed humanity to break.
And wherever the Whisper was heard,
civilisation began destroying itself long before the demons arrived.