rite_yearly_hor_divergence_drift_apply_effect

rite_yearly_hor_divergence_drift_apply_effect = {
	save_scope_as = diverged_rite
	head_of_rite = { save_scope_as = diverged_hor }

	# Snapshot the rite's current tenets and (HoR-known) doctrines so we can identify what change_rite_divergence swapped in.
	every_rite_tenet = {
		add_to_list = drift_tenets_before
	}
	scope:diverged_hor = {
		every_character_doctrine = {
			rite_filter = scope:diverged_rite
			add_to_list = drift_doctrines_before
		}
	}

	random_list = {
		100 = {
			trigger = {
				"divergence(faith.main_rite)" <= 40
			}
			modifier = {
				factor = 0.5
				"divergence(faith.main_rite)" >= 30
			}
			modifier = {
				# Low fervor faiths drift outward more readily.
				factor = 1.5
				faith.fervor <= @hor_drift_low_fervor
			}
			modifier = {
				factor = 0.6
				faith.fervor >= @hor_drift_high_fervor
			}

			save_scope_value_as = { name = diverged_change value = 1 }
			rite_yearly_hor_divergence_drift_forward_pick_effect = yes
		}
		100 = {
			trigger = {
				"divergence(faith.main_rite)" >= 10
				faith.rite_growth_rites_needed <= 0
				trigger_if = {
					limit = {
						exists = faith.religious_head
					}
					scope:diverged_hor = {
						OR = {
							opinion = {
								target = scope:diverged_rite.faith.religious_head
								value >= 50
							}
							has_dread_level_towards = {
								target = scope:diverged_rite.faith.religious_head
								level >= 1
							}
						}
					}
				}
				trigger_else = {
					always = yes
				}
			}
			modifier = {
				# Mirror the forward throttle: when divergence is small there's less room to walk it back.
				factor = 0.5
				"divergence(faith.main_rite)" < 20
			}
			modifier = {
				factor = 1.3
				faith.fervor >= @hor_drift_high_fervor
			}
			modifier = {
				# Consolidation belongs to high-fervor faiths; sub-70 fervor is the divergence regime.
				factor = 0.2
				faith.fervor < @hor_drift_high_fervor
			}
			modifier = {
				# Without a HoF to anchor consolidation, backward drift is much rarer.
				factor = 0.2
				NOT = { exists = faith.religious_head }
			}
			save_scope_value_as = { name = diverged_change value = -1 }
			rite_yearly_hor_divergence_drift_backward_pick_effect = yes
		}
	}
}

As written in game/common/scripted_effects/pam_effects.txt.