Congrats. Got my first on a drop from the Crucible. I was so ignorant I stuck it in the vault for a while because I wasn't going to waste my exotic slot on a rocket launcher (I know...I know...I was foolish). Second came from a Nightfall drop. Just got my third from a Prison of Elders level 28 big chest. I'm hoping to get 2 more so I can Voltron 5 Gjallarhorns into one giant Gjallarhorn. What would be even better is if this giant Gjallarhorn shot out other Gjallarhorns that detonated into clusters of smaller Gjallarhorns. You'd bludgeon your opponents to death from all the blunt force trauma of Gjallarhorns flying into them.