Certain trait-related events reduce or increase decadence. Granting land to male relatives decreases decadence, as does participating in jihads, holy wars and fighting crusades. Males in the dynasty increase decadence when they get decadent trait. It is a measure of how prone your dynasty is to luxurious self-indulgence. Decadence - Decadence is a quantity measured on a dynasty-by-dynasty basis out of 100 percent.
