fp3_struggle_apply_independent_vassalage_catalyst_effect

fp3_struggle_apply_independent_vassalage_catalyst_effect = {
	$NEW_LIEGE$ = {
		# Involved characters vassalising an independent involved ruler.
		if = {
			limit = {
				any_character_struggle = {
					involvement = involved
					activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
						CATALYST = catalyst_vassalize_independent_ruler
						CHAR = $NEW_VASSAL$
					}
				}
			}
			every_character_struggle = {
				involvement = involved
				limit = {
					activate_struggle_catalyst_secondary_character_involvement_involved_trigger = {
						CATALYST = catalyst_vassalize_independent_ruler
						CHAR = $NEW_VASSAL$
					}
				}
				activate_struggle_catalyst = {
					catalyst = catalyst_vassalize_independent_ruler
					character = $NEW_LIEGE$
				}
				log_debug_variable_for_persian_struggle_effect = { VAR = stabil_catalyst_vassalize_independent_ruler }
			}
		}
	}
}

As written in game/common/scripted_effects/05_dlc_fp3_scripted_effects.txt.