The invasion can be very destructive. The factions who attack are mostly hordes or similar factions, so they tend to raze a lot of settlements. Additionally, there is a global +2 Chaos Corruption during the invasion.
Factions involved in the invasion:
- Warriors of Chaos are the primary aggressors. In Mortal Empires this is expanded to also include these subfactions:
- Some Norscan Tribes:
Opposing Chaos is The Empire, Dwarfs, Bretonnia and other human factions. In Mortal Empires, they are joined by High Elves and Lizardmen. These factions gain the diplomatic trait Shield of Civilization during a Chaos Invasion, making them more likely to stick together against Chaos.
Wood Elves remain neutral, but have negative diplomatic relations with Chaos factions, especially Beastmen whom they hate.
Many factions have a campaign victory condition that involves killing/dealing with Archaon and the Warriors of Chaos.
What happens if I'm playing as the Warriors of Chaos or Norsca?
When you are playing Norsca (or Wintertooth), you will get an event called The Everchosen's Summons which allows them to choose to side with Archaon/The Warriors of Chaos, or to side against them and bring about your own invasion.
If you are playing Warriors of Chaos themselves, then you will still have to fight a rival faction called Chaos Gathering, led by Sarthorael the Everwatcher. In addition, Varg and Skaeling will not automatically be your vassals, but you have the ability to Awaken the Tribes to call addition Norscan Tribes to the map.
How it plays out
- The event Chaos Stirs indicates the initial spawning of Warriors of Chaos armies in the Chaos Wastes.
- The event The Doom Tide indicates the start of the full Chaos Invasion.
- When Archaon and the Warriors of Chaos are finally defeated for good, the invasion is over.