I've been playing since day one and could never get it to drop. Well, I finally found out where every Gjallarhorn in Destiny originates from.
http://i1144.photobucket.com/albums/o493/Tr1llmatic/Mobile%20Uploads/60D140E3-D401-4C85-B297-3D8F4771FD7F.png.jpeg
Who knew?
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Just manage to do one kill in nightfall and gally is yours :) https://www.bungie.net/en/Forum/Post/127284330/0/0