pam_holy_myron_consume_charge_effect

pam_holy_myron_consume_charge_effect = {
	if = {
		limit = { exists = $ARTIFACT$ }
		$ARTIFACT$ = {
			change_variable = {
				name = pam_holy_myron_charges
				subtract = 1
			}
		}
		if = {
			limit = {
				$ARTIFACT$ = { var:pam_holy_myron_charges <= 0 }
			}
			$ARTIFACT$ = { save_scope_as = pam_holy_myron_spent_vessel }
			$ARTIFACT$.artifact_owner ?= {
				trigger_event = pam_holy_myron.0002
			}
		}
		else = {
			$ARTIFACT$ = {
				save_scope_as = pam_myron_vessel
				if = {
					limit = { rarity = masterwork }
					set_artifact_description = pam_holy_myron_artifact_desc_charged_masterwork
				}
				else_if = {
					limit = { rarity = famed }
					set_artifact_description = pam_holy_myron_artifact_desc_charged_famed
				}
				else_if = {
					limit = { rarity = illustrious }
					set_artifact_description = pam_holy_myron_artifact_desc_charged_illustrious
				}
				else = {
					set_artifact_description = pam_holy_myron_artifact_desc_charged_common
				}
			}
		}
	}
}

As written in game/common/scripted_effects/pam_effects.txt.