The decay rate of a material is -0.25 per month.
How To Speed Up Tyranny Decay & Reduce Tyranny Gain
#1 Personality Traits
Only the Callous trait has any impact on tyranny. This lowers tyranny gain by -20%.
#2 Buildings
The Palace of Aachen, a building found in the county of Aachen, also lowers tyranny gain by -20%. This is typically within the Holy Roman Empire, towards the north.
The Shwedagon Pagoda is another option here with -10% Tyranny gain.
This can be found in the county of Dagon, on the far east of the map.
#3 Perks And Lifestyle Traits
The Soon Forgiven perk from the Administrator tree lowers Tyranny by -0.15 per month. This is the largest active decrease of Tyranny currently available in the game. ..
In the Theologian lifestyle, Defender of the Faith is a helpful perk that reduces Tyranny gain by -25%. This bonus is only available for religions with the Righteous doctrine.
#4 Dynasty Legacies
In the Guile Dynasty Legacy, the Venial perk reduces Tyranny by -0.05 per month. This is the lowest active reduction available.
#5 Religions
The Pursuit of Power tenet lowers tyranny by -50%. You can add this tenet during a religious reformation.
The Donyi-Poloism and Sedism religions that are also holding the holy site Pemako lower Tyranny gain by -20% as well.
The Bidaism and Siguism religions offer both types of benefits, as long as they have the holy site Niani. They lower Tyranny by -0.1 per month and reduce Tyranny gain by -20%.
#6 Difficulty Levels
Choosing the difficulty level for Tyranny can have a large impact on how challenging the game is. ..
Tyranny’s difficulty has been lowered by 25% on Easy and 75% on Very Easy. This only applies to the player character, unlike earlier examples. ..
What Happens When Tyranny Is Too High?
At high Tyranny levels, your vassals may plot against you or join other factions in order to gain an advantage.
High individual opinions and high dread can help to mitigate high Tyranny, since characters will either still like you or be too scared to do anything.
At high tyranny levels, the chance of multiple factions forming at once is increased. This can lead to instability and conflict. ..
Tyranny can be as bad as you want it to be. Make sure you are aware of the potential consequences of taking multiple tyrannical actions, as even small transgressions can lead to large problems. ..
While Tyranny-gaining actions can be useful in dealing with annoying characters, it is important to avoid using them too frequently in order to avoid mass revolts across your realm.
