To the undead those map markers denoting where a huge battle took place are more than just a reminder of a great battle, they are a harvestable resource which provides them with skeletons and zombies, their lowest tier troops.  Dead troops can also be summoned back to fight for you in battles and even if the unthinkable happens and your entire army and hero are slain, there is a way to reanimate that dead hero.  Being undead does have its disadvantages, wandering beyond provinces you own will cause massive attrition as your army starts to decay and disintegrate around you and as Rock, Paper, SHOTGUN discovered, zombies are rubbish.  You can read about their experiences when giving the Vampire Counts factions a test as well as see a video of the Master Necromancer right here.

"The undead don’t behave like any faction previously seen in a Total War game. That makes sense. They shouldn’t. Even the most militant and war-ready hordes can’t repopulate the ranks of their warriors quite as efficiently as an army capable of raising the dead and commanding them to fight."

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