add_scaled_artifact_modifier_combat_effect

add_scaled_artifact_modifier_combat_effect = {
	random_list = {
		# Knight Limit
		20 = {
			trigger = {
				OR = {
					rarity = famed
					rarity = illustrious
				}
			}
			modifier = {
				exists = scope:inspiration_owner
				scope:inspiration_owner = { has_variable = chosen_knights_mod }
				add = 160
			}
			if = {
				limit = {
					rarity = famed
				}
				add_artifact_modifier = artifact_knight_limit_1_modifier
			}
			else_if = {
				limit = {
					rarity = illustrious
				}
				add_artifact_modifier = artifact_knight_limit_2_modifier
			}
		}

		# Knight Effectiveness
		20 = {
			modifier = {
				exists = scope:inspiration_owner
				scope:inspiration_owner = { has_variable = chosen_knights_mod }
				add = 160
			}
			if = {
				limit = {
					rarity = common
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_knight_effectiveness_1_modifier
					}
					15 = {
						add_artifact_modifier = artifact_knight_effectiveness_2_modifier
					}
					5 = {
						add_artifact_modifier = artifact_knight_effectiveness_3_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = masterwork
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_knight_effectiveness_4_modifier
					}
					15 = {
						add_artifact_modifier = artifact_knight_effectiveness_5_modifier
					}
					5 = {
						add_artifact_modifier = artifact_knight_effectiveness_6_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = famed
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_knight_effectiveness_7_modifier
					}
					15 = {
						add_artifact_modifier = artifact_knight_effectiveness_8_modifier
					}
					5 = {
						add_artifact_modifier = artifact_knight_effectiveness_9_modifier
					}
				}
			}
			else_if = {
				limit = {
					rarity = illustrious
				}
				random_list = {
					20 = {
						add_artifact_modifier = artifact_knight_effectiveness_10_modifier
					}
					15 = {
						add_artifact_modifier = artifact_knight_effectiveness_11_modifier
					}
					5 = {
						add_artifact_modifier = artifact_knight_effectiveness_12_modifier
					}
				}
			}

			modifier = { # More likely if you have any "knightly" cultural traditions
				factor = 1.5
				scope:owner.culture ?= {
					OR = {
						has_cultural_tradition = tradition_chivalry
						has_cultural_tradition = tradition_martial_admiration
						has_cultural_tradition = tradition_futuwaa
						has_cultural_tradition = tradition_druzhina
						has_cultural_tradition = tradition_chanson_de_geste
					}
				}
			}
		}

		# negate_prowess_penalty_add
		20 = {
			trigger = {
				artifact_slot_type = armor
			}

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