Claíomh Solais
The Sword of Light or Claidheamh Soluis (Old Irish; modern Irish: Claíomh Solais [ˌklˠiːw ˈsˠɔlˠəʃ]) is a trope object that appears in a number of Irish and Scottish Gaelic folktales. The "Quest for sword of light" formula is catalogued as motif H1337.