Husk of the pit

So for those who don't know to get the epic auto rifile that is necrochasm you have to evolve a common one first. More specifically the husk of the pit. The husk is then evolved by an embalming orb into the legendary eidolon ally and once more after that to necrochasm. Finding the husk of the pit is extremely rare..... Here is how to get it in around an hour or less. Patrol the cosmodrome and stay in the first area. Become familiar with the blade of crota spawns, one below at the broken subway and one in a cave to the right if your guardian spawn. Bring along some vangaurd bounties to work on while you wait on the balde to spawn. Once the text on the bottom left reads "minions of crota have began a ritual" haul ass to the location! It has not be confirmed but I have a theory which has worked on all my characters and each of my friends. I believe the key is speed. Take the acolytes and blade out as quick as you can via super or heavy weaponry. Each time I received a husk it was at the cave spawn and on each occasion I took the blade out before he could even leave the cave. Each time I have gone for a husk or taken somebody to get one it has taken at least 25-30 mins. Obviously this could be a massive coincidence but that tactic seems to work quite well!! Good luck