create_artifact_urn_effect

create_artifact_urn_effect = {
	# Get the character the artifact is being made for.
	$OWNER$ = { save_scope_as = owner }
	$POTTER$ = { save_scope_as = potter }
	if = { #Any existing dummy character gets turned into the potter
		limit = {
			exists = scope:dummy_gender
			scope:potter = scope:dummy_gender
		}
		clear_saved_scope = potter
		clear_saved_scope = dummy_gender
	}
	hidden_effect_new_object = {
		# Get artifact quality, wealth, materials, and decorations
		get_artifact_quality_effect = yes
		get_artifact_wealth_effect = yes

		# Create the artifact
		if = {
			limit = { exists = scope:adventurer }
			create_artifact = {
				name = artifact_urn_name
				description = placeholder
				visuals = urn
				type = urn
				modifier = artifact_placeholder_modifier
				wealth = scope:wealth
				quality = scope:quality
				save_scope_as = newly_created_artifact
				history = {
					location = scope:location
					actor = scope:adventurer
					recipient = root
					type = discovered
				}
			}
		}
		else_if = {
			limit = {
				scope:host ?= $OWNER$
				scope:activity ?= { has_activity_type = activity_tournament }
			}
			create_artifact = {
				name = artifact_urn_name
				creator = scope:host
				description = placeholder # Will be updated in the post-creation effects after decorations are assigned.
				visuals = urn
				type = urn
				modifier = artifact_placeholder_modifier
				wealth = scope:wealth
				quality = scope:quality
				history = {
					type = prize_created
					recipient = scope:host
				}
				save_scope_as = newly_created_artifact
			}
		}
		else_if = {
			limit = { exists = scope:potter }
			create_artifact = {
				name = artifact_urn_name
				creator = scope:potter
				description = placeholder # Will be updated in the post-creation effects after decorations are assigned.
				visuals = urn
				type = urn
				modifier = artifact_placeholder_modifier
				wealth = scope:wealth
				quality = scope:quality
				save_scope_as = newly_created_artifact
			}
		}
		else = {
			create_artifact = {
				name = artifact_urn_name
				description = placeholder # Will be updated in the post-creation effects after decorations are assigned.
				visuals = urn
				type = urn
				modifier = artifact_placeholder_modifier
				wealth = scope:wealth
				quality = scope:quality
				save_scope_as = newly_created_artifact
				history = { type = created_before_history }
			}
		}
		scope:newly_created_artifact = {
			# Finish generating decorations and update description
			get_artifact_feature_references_effect = yes
			set_artifact_description = artifact_urn_description
			# Add artifact modifiers
			add_scaled_artifact_modifier_grandeur_small_effect = yes
			add_scaled_artifact_modifier_minor_prestige_effect = yes
			if = {
				limit = {
					OR = {
						rarity = famed
						rarity = illustrious
					}
				}
				add_scaled_artifact_modifier_majesty_effect = yes
			}
			set_variable = {
				name = quality
				value = scope:quality
			}
			set_variable = {
				name = wealth
				value = scope:wealth
			}
		}
	}
}

As written in game/common/scripted_effects/00_ep1_artifact_creation_effects.txt.