Ok so, this is what I did to get that gun. I played "fist of Crota" on normal mode. I also had a black wax idol equipped. I just kept killing the blade of Crota that spawns as you run through that building past that screeching wizard bitch. If he doesn't drop it. Go to orbit and repeat the process. Took me 6 attempts. But it's random so it can take more or less attempts. EDIT: id like to clarify a few things to help those still trying or gonna make the attempt. 1st, a black wax idol is not required to obtain this weapon. 2nd, there is no bounty tied to acquiring this weapon. 3rd. it seems to be more of a random award when defeating a blade of crota, either done through a patrol or this mission. 4th. you will need hive kills to unlock the upgrade that requires a embalming orb which upgrades it to legendary status and a whole new weapon, someone else posted proof that they had this legendary on the forums. one last thing, good luck to all those still trying, for RNG is a whore. EDIT 2: hey I would just like to say thanks for all the likes and comments. I hope this has helped those in their quest for this infamous weapon. P.S- today's my birthday! (December 18th)