system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer Fantasy] With all the terribly lethal and unfriendly races that share the The Old World, how did humanity ever form communities or nations and advanced technology without being immediately crushed by the other physically superior races?
gpt
Humans were once fragmented into tribes, skirmishing with each other, struggling to survive. Eventually, a young blacksmith named Sigmar rose to become leader of his tribe, leading the defense during a (Greenskin or Beastmen) raid. 

He was obviously blessed, and his strength and charisma allowed him to unite most of the human tribes, leading them in a devastatingly effective campaign against the Greenskins, driving them back to their caves in the mountains. 

Sigmar spawned a line of strong leaders, who worked to form the Empire. Humanities greatest strength is unity, and also their leader's ability to beat the crap out of enemy leaders with a huge ass hammer.