I already completed The Final Shape Campaign I have the tessellation exotic fusion rifle, and the "Patterns & Catalysts" says it's catalyst can be "Acquired from Ghost after a quest within The Final Shape." SO, i checked with the Ghost after the Last Final Shape Mission, Excision, and it just wasn't there. I searched in google how to get it and it said the same thing, that it would be unlocked after completing the Final Shape Campaign, and that I could obtain it either from the Ghost in the Old Tower, or going to the Special Deliveries mailbox, and it wasn't in any of the above. So, I searched this problem, and was told to try to close and re-open the game to see if it would appear, but to no avail. So, I don't know what to do, if this is a bug or a glitch, I would really hope to have your help. G-day!