Windbeam

Windbeam was the name of the great Horn of Elendil blown only in extreme circumstances, according to one of the outlines of The Lord of the Rings as published in The Treason of Isengard . Other than this outline, the horn is not mentioned in any other writing on Middle-earth . It was, however, mentioned in the Letters from Father Christmas , stating that Father Christmas had not had to blow it for over four hundred years.