From Destinypedia, the Destiny wiki
BrayTech Osprey is a Legendary Rocket launcher that could be acquired from the Nightfall version of the Strange Terrain Strike. In Season of Arrivals, it was given to players by Ana Bray after completing her portion of the Exodus quest as the strike was due to be vaulted.
"Did you find anything strange about the latest Warmind hashes?"
List of appearances