The Gjallarhorn is now one of the most prestigious and most valuable guns in destiny. The Gjallarhorn is the "Resounding Horn" the God Heimdallr uses when the Ragnorok(end of the world) is upon us. Now Heimdallr is described as "the one who illuminates the world". Kinda like the Gjallarhorn which destroys and illuminates different ways of beating enemies. But guess where Heimdallr came from? The NINE mothers. Who else in destiny is associated with NINE? The Dirty tentacled face bastard XÜR. That's one theory on it. The other NINE theory is the NINE realms which Norse mythology says exist. The Gjallarhorn is to warn all NINE realms of the world when Ragnorok is upon them. So who are the NINE? Have they not sold the Gjallarhorn more than once bc it is to valuable? Will we come in contact with NINE? Maybe in the Expansion 4: Forge Of the Gods maybe. Or are the NINE right in front of us? This all theory keep in mind but bungie likes to have more meaning to things than meets the eye. Let me know if you guys have anything else to add.