There are two Gjallarhorns in Rise of Iron. There's the original one that you get from completing a quest line and the Iron Gjallarhorn from pre-order. The Iron Gjallarhorn is most likely going to be a legendary weapon and be extremely underpowered. The original Gjallarhorn that you get from the quest will be more powerful but will more than likely be a fraction of its former self. I was really hoping they would do away with 3oC's and quest exotics. I miss the days where exotics would drop randomly from raids or strikes, it made it a little more exciting whenever you got one. Nowadays, every Friday when Xur comes, everybody knows they are guaranteed a handful of exotics just from buying 3oC's. But, as I was saying about Gjallarhorn, don't get your hopes up about the iron Gjallarhorn. Case in point, the Suros Preorder Pack.