A new Year Three/Rise of Iron variant of the Gjallarhorn exotic rocket launcher can only be acquired through a series of quests in the latest Destiny: Rise of Iron DLC. Destiny players will have to begin their quests with "Echoes of the Past" until finally reaching "Beauty in Destruction." Once the quests are complete, a handy 350-Attack Gjallarhorn weapon will be awarded.
Thankfully, YouTuber noblewarrior99 shared his Year Three Gjallarhorn quest in a video last week. First, you'll have to complete the campaign of the latest Destiny: Rise of Iron DLC. Next, be sure to have a Splicer Key to open an area to obtain the Gjallahorn. Finally, head over to Archon's Keep to find a patrol mission that asks to locate and analyze an anomoly. This triggers the next part of the Gjallahorn quest.
Without further ado, watch noblewarrior99's walkthrough below to get your own Year Three Gjallahorn: