Smash!

Dark clouds gather on the horizon. The ground trembles and birds take flight as an ominous rumbling rolls through the forest. Villagers working in the fields drop their tools and flee before the shadow that flows over the land. The stout wooden gates of the town are closed and barred, the strongest armed and the weakest hidden in cellars and hay lofts. A lone greenskin, scout and assasin, looks out from the forest, sniffing the air.

"Manflesh," he grunts and his leader growls an order. With an unholy roar the Warband of Grot the Discourteous falls upon the village.

Or, to put it another way, Age 5 has started.