If your trying to go for thorn here is some advice. I completed my bounty with a void shotgun and a void lmg. recommending both of those types of weapons. If you have a chance of getting Atheon's epilogue or already have it that weapon will be your best friend. Also remember do not just go blindly into battle where a firefight is taken place. That may result in more deaths than kills. If you pick off stragglers then there is a large chance you can pull of a positive k.d. Happy hunting! Never give up no mater the cost.