@MelcavukI also started working on the short timeline:
Age of Myth
Discovery By Sigmar
Grungni is found by Sigmar tied to the Iron Mountains alongside his brother Grimnir. This is the start of a long-running friendship between the two gods.
The Council of Iron
Grungni founds the Council of Iron, a pantheon within that of Sigmar's that contains sixteen other blacksmithing gods, aelf, duardin and human. In turn, they found the Ironweld, and each god creates his own sect within it. Some of these scets rise in power and stature and become renown throughout the realms. For example, Cor Temporis, the Walking City, founded by the human demigod Askror, is known for its steady crawl across Hysh, and many a Chaos host has shattered against its walls.
The Death of Grimnir
Grimnir, brother of Grungni, battles Vulcatrix and they destroy each other. When Grungni hears of the news, he roars so loudly that it is heard all over Chamon. The fledgling fortresses of the Ironweld all quiver in rage, and it is said that some sprouted legs, wheels, mouths and even minds. These fortresses become known as Cog-forts, and before long, every weld has its own mechanical castle.
Collapse of the Council of Iron
The Council of Iron collapses as Chaos begins to gather. The humans and duardin gods turn on the aelven deities, fearful of their sly ways, and all five of them are killed. Three human and two duardin demigods are defeated, leaving the Council a mere six strong. The Council of Iron collapses, and the remaining deities retreat in shame.