create_artifact_box_medium_effect

create_artifact_box_medium_effect = {
	# Get the character the artifact is being made for.
	$OWNER$ = { save_scope_as = owner }
	$CARPENTER$ = { save_scope_as = carpenter }
	hidden_effect_new_object = {
		# Get artifact quality, wealth, and materials
		get_artifact_quality_effect = yes
		get_artifact_wealth_effect = yes
		if = { #IF we have set the location we use it for the materials
			limit = { exists = scope:location }
			scope:location = { add_to_list = artifact_material_sources }
		}

		# Create the artifact
		scope:owner = {
			if = {
				limit = {
					exists = scope:adventurer
				}
				create_artifact = {	
					name = artifact_box_medium_name
					creator = scope:adventurer
					description = placeholder
					visuals = medium_box
					type = box
					modifier = artifact_placeholder_modifier
					save_scope_as = newly_created_artifact
					wealth = scope:wealth
					quality = scope:quality
					#decaying = no
					history = {
						location = scope:location
						actor = scope:adventurer
						recipient = root
						type = discovered
					}
				}
			}
			else = {
				create_artifact = {	
					name = artifact_box_medium_name
					creator = scope:carpenter
					description = placeholder
					visuals = medium_box
					type = box
					modifier = artifact_placeholder_modifier
					save_scope_as = newly_created_artifact
					wealth = scope:wealth
					quality = scope:quality
					#decaying = no
				}
			}
		}
		scope:newly_created_artifact = {
			get_artifact_feature_references_effect = yes
			set_artifact_description = artifact_box_medium_description

			# Set grandeur
			add_scaled_artifact_modifier_grandeur_small_effect = yes
			add_scaled_artifact_modifier_piety_effect = yes
			if = {
				limit = {
					OR = {
						rarity = famed
						rarity = illustrious
					}
				}
				add_scaled_artifact_modifier_dynasty_prestige_effect = yes
			}
			remove_artifact_modifier = artifact_placeholder_modifier
		}
	}
}

As written in game/common/scripted_effects/01_ep1_court_artifact_creation_effects.txt.