Vampire Counts fight internally until there’s no one left to fight, and then decide to kill everyone else and defile their lands for good measure.
The Empire forms from a loose confederacy into an unstoppable tide. Dwarfs get a public order penalty the more battles they lose, carefully noting every grudge down in a hefty tome.
But Total Warhammer takes all those half-ideas and formalizes them, wraps them into the lore.