christian_saint_bone_creation_effect

christian_saint_bone_creation_effect = { 
	if = {
		limit = {
			has_royal_court = yes
			OR = {
				faith = faith:catholic
				faith = faith:orthodox
				faith = faith:miaphysitism
				faith = faith:armenian_apostolic
				faith = faith:nestorian
				rite = { rite_has_parameter = christian_syncretic_actor }
			}
		}
		hidden_effect = {
			random = {
				chance = 10 # 10% base chance
				modifier = {
					add = 10 # 20% chance for medium
					exists = scope:activity
					exists = var:pilgrimage_distance
					scope:activity.var:pilgrimage_distance = flag:medium_pilgrimage_var
				}
				modifier = {
					add = 20 # 30% chance for long
					exists = scope:activity
					exists = var:pilgrimage_distance
					scope:activity.var:pilgrimage_distance = flag:long_pilgrimage_var
				}
				modifier = {
					add = 30 # 40% chance for very long
					exists = scope:activity
					exists = var:pilgrimage_distance
					scope:activity.var:pilgrimage_distance = flag:very_long_pilgrimage_var
				}
				modifier = {
					add = 10
					has_character_flag = mid_pious_reward
				}
				modifier = {
					add = 20
					has_character_flag = high_pious_reward
				}
				modifier = {
					add = 30
					has_character_flag = perfect_pious_reward
				}
				modifier = { # half as likely for AI
					factor = 0.5
					is_ai = yes
				}
				save_scope_as = saint_bone_owner
				hidden_effect_new_object = {
					create_artifact = {
						name = christian_saint_bone_name
						description = christian_saint_bone_description
						type = pedestal
						visuals = bone
						template = saintly_bones_template
						modifier = artifact_monthly_piety_1_modifier
						save_scope_as = christian_saint_bone_scope
					}
					scope:christian_saint_bone_scope = {
						set_variable = { # required to track usability for template
							name = saint_bone_faith
							value = scope:saint_bone_owner.faith
						}
						set_variable = { # required to track usability for template
							name = holy_site_var
							value = scope:saint_bone_owner.involved_activity.activity_location.county
						}
					}
					scope:activity ?= {
						add_activity_log_entry = {
							key = pilgrimage_completed_relic_log
							score = 75
							tags = { complete }
							character = scope:host
							artifact = scope:christian_saint_bone_scope
							show_in_conclusion = yes
							# Effects
							scope:christian_saint_bone_scope = {
								if = {
									limit = { artifact_owner != root }
									set_owner = root
								}
							}
						}
					}
				}
			}
		}
	}
}

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