According to Mandos' prophecy, following Melkor's final return and defeat in the Dagor Dagorath, or the Battle of Battles, the world will be changed and the Silmarils will be recovered by the Valar. Fëanor will be released from the Halls of Mandos and give Yavanna the Silmarils. Depending on the version of the story, either she or Fëanor will break them, and Yavanna will revive the Two Trees. The Pelóri Mountains will then be flattened and the light of the Two Trees will fill the world in eternal bliss.