Not sure what you mean. The Necrochasm (Exotic Auto Rifle) is obtained by upgrading your Eidelon Ally with a Crux of Crota only received after beating Crota on [b]Hard Mode.[/b] To obtain the Eidelon Ally, you must upgrade a Husk of the Pit. [b]To Get Husk of the Pit: [/b] Load up Fist of Crota on Earth, proceed through until you reach the Hive ritual, kill the Blade of Crota, go to orbit, repeat until gotten. NOTE: You [b]do not[/b] need the House of Wolves DLC to obtain this gun. You [b]do[/b] need the Dark Below DLC on the other hand.