add_2_scaled_artifact_modifier_devotion_effect

add_2_scaled_artifact_modifier_devotion_effect = {
	random_list = {
		pick = 2
		unique = yes
		# monthly_piety
		20 = {
			if = {
				limit = {
					rarity = common
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_1_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_2_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = masterwork
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_3_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_4_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = famed
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_5_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_6_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = illustrious
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_7_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_8_modifier
					}
				}
			}
		}
		# monthly_piety_gain_mult
		20 = {
			if = {
				limit = {
					rarity = common
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_1_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_2_modifier
					}
					5 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_3_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = masterwork
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_4_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_5_modifier
					}
					5 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_6_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = famed
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_7_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_8_modifier
					}
					5 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_9_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = illustrious
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_10_modifier
					}
					15 = {
						add_artifact_modifier = artifact_monthly_piety_gain_mult_11_modifier
					}

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