steal_back_artifact_success_effect

steal_back_artifact_success_effect = {
	scope:target = {
		add_opinion = {
			target = scope:owner
			modifier = stole_artifact_from_me
		}
		# Feud score
		scope:owner.house = {
			change_house_relation_feud_score_effect = {
				TARGET = scope:target.house
				REASON = stole_artifact
				VALUE = house_feud_medium_counter_value
			}
		}
		# Contracts
		hidden_effect = {
			if = {
				limit = {
					any_character_task_contract = {
						task_contract_type  = laamp_steal_artifact_contract
						var:task_contract_target ?= scope:target
					}
				}
				random_character_task_contract = {
					task_contract_type  = laamp_steal_artifact_contract
					limit = {
						var:task_contract_target ?= scope:target
					}
					complete_task_contract = success_standard
				}
			}
		}
	}
}

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