The Emperor Sigismund was given this huge enchanted horn by the Dwarfs after the Battle of Grimgrill Dale. After the death of Sigismund during the Siege of Altdorf, the horn passed into the keeping of the Temple of Sigmar. It has remained in the temple ever since, and is blown three times on the anniversary of the death of Sigismund as a solemn reminder of the dark days when the Empire was ravaged by Orcs and Altdorf was almost destroyed. When the War Altar goes to battle the Horn of Sigismund is taken as well. The Horn is sounded by the Theogonist as the War Altar charges into combat.