create_artifact_chest_effect

create_artifact_chest_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

		scope:owner = {
			# Create the artifact
			create_artifact = {	
				name = artifact_chest_name
				creator = scope:carpenter
				description = placeholder # Will be regenerated in the post-creation effects
				visuals = chest
				type = chest
				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_chest_description
			set_variable = {
				name = big_chest
				value = yes
			}
			
			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.