You should be able to upgrade the Khvostov like the necrochasm. It should be able to be upgraded to the next weapon rarity with strange coins. The amount of SC needed increases as you upgrade and the gun has to have all upgrades maxed. Khvostov (Uncommon) 1 Strange Coin Khvostov (Rare) 10 Strange Coins Khvostov (Legendary) 23 Strange Coins The exotic would be obtained by complaining numerous task. Finally once those tasks are complete you must purchase a Golden Age Weapon Frame from Xûr which cost 5 Exotic Shards and 25 Primary Weapon Synthesis. The Khvostov would then become the Exotic Weapon known as, [i]Your Ally[/i] Like the idea?