[quote]I got my Necrochasm many months ago, and today, I decided to play it in a new useless build. I was checking for his catalyst, and it seemed like I had to proceed with the quest, but I didn't have it. No, not even the postmaster. Does someone have a solution?[/quote] There is no mission for the catty. [spoiler]It requires you to beat two timed secret hidden events within the Crota's End that are started by standing on plates that glow green while holding Necrochasm to spawn waves of enemies and then finally farm 15 more Essences of the Oversoul to finalize the catalyst.[/spoiler]