Sea shell horns were large horns that were hung within the guard towers that encircled the city of Fitsay on the planet Sedri. The horns were blown by the warrior monk manning the tower to signal to others that trouble was approaching. During the renegade attack on the settlement, one of the warrior monks used the horn on their tower to sound the alarm. A similar horn was installed in the center of the Audience Hall in Fitsay, and was blown to announce the arrival of High Priest Cardo.[1]