humsacd_a_hof_effect

humsacd_a_hof_effect = {
	if = {
		limit = {
			$SACRIFICER$.faith = { has_doctrine_parameter = human_sacrifice_active }
			$SACRIFICED_HOF$.faith = {
				religious_head = $SACRIFICED_HOF$
				NOT = { has_doctrine_parameter = human_sacrifice_active }
			}
		}
		$SACRIFICER$ = {
			# Save scopes for future events.
			save_scope_as = sacrificer
			# Forever tarnished to members of the faith.
			add_to_variable_list = {
				name = humsacd_hofs
				target = $SACRIFICED_HOF$.faith
			}
		}
		# Give $SACRIFICED_HOF$'s faith some fervour for this atrocity.
		$SACRIFICED_HOF$ = {
			# Save scopes for future events.
			save_scope_as = sacrificed_hof
			# Up fervour.
			faith = {
				change_fervor = {
					value = hof_humsacd_fervour_gain
					desc = fervor_sacrificed_our_head_of_faith
				}
			}
			# Martyr the HoF explicitly if possible.
			if = {
				limit = {
					OR = {
						has_bad_nickname = yes
						has_any_nickname = no
					}
				}
				give_nickname = nick_the_martyr
			}
		}
		# Inform players of the consequences.
		## Scope:sacrificer is now cheaper to holy war if they're a separate faith.
		if = {
			limit = {
				scope:sacrificer.faith != scope:sacrificed_hof.faith
			}
			every_player = {
				limit = { faith = scope:sacrificed_hof.faith }
				trigger_event = fp1_other_decisions.0021
			}
		}
		# Inform scope:sacrificer about any consequences if appropriate.
		scope:sacrificer = {
			# ... Eventually.
			if = {
				limit = {
					faith != scope:sacrificed_hof.faith
				}
				trigger_event = {
					id = fp1_other_decisions.0022
					months = 1
				}
			}
		}
	}
}

As written in game/common/scripted_effects/00_religious_interaction_effects.txt.