The Eye of the Gods: This rule makes chaos characters that are victorious in challenges or kill a large target to roll a 2d6 on a special Eye of the Gods-table that has mostly positive effects such as minor stat boosts that will stay on until the game ends. The EotG-rolls are also available for other units if the chaos player wields a warshrine. The downside is that all chaos characters must challenge if able.
The Will of Chaos: Chaos units with this rule can reroll failed panic tests.