Sigmar Heldenhammer was born a man, chieftain of the Unberogen, in an age when the human tribes of the west were scattered and beset on every side by greenskins, beastmen, and the horrors of the dark. Rescuing the dwarf king Kurgan Ironbeard from an orc warband, he was gifted the runehammer Ghal Maraz, and with it forged an alliance between men and dwarfs that would echo down the centuries.
At Black Fire Pass he broke the greatest greenskin horde the world had yet seen, and upon that victory he united the tribes into a single nation, crowned its first Emperor. For fifty years he ruled, driving back the enemies of mankind and laying the foundations of law, faith, and kingship. Then, his work done, he laid aside his crown and walked alone into the eastern mountains, never to be seen again.
In the long centuries since, the man became a god. The Cult of Sigmar rose to become the state faith of the Empire of Man, its Grand Theogonist a power to rival the Emperor himself, its warrior-priests marching to battle with hammer and prayer. To the common folk he is courage made divine, the promise that mortal men, though frail, may yet stand against the terrors of a merciless world.
His sign is the twin-tailed comet, and where it burns in the night sky the faithful know that Sigmar watches still, and that the hour of mankind's greatest need may also be the hour of his return.
The pantheon continues
