The final step for getting an exotic sword is running a Light 300 version of the Darkblade strike on the Dreadnaught. This version adds the elemental-shielded Warden knights from the Founts area to the boss fight, and requires that you kill the Knight with the elemental shield corresponding to the element of the sword you're trying for no more than 30 seconds before killing the boss.
Narcogen assembles the last materials into the weapon frame for the Touch of Malice exotic scout rifle, then gets help from Blackstar and bluerunner help Narcogen to take down a Wizard miniboss in a special version of the Fear's Embrace story mission to finally earn the weapon.
The last of the 45 calcified fragments is in the hands of Court of Oryx Tier 3 boss, Thalnok, who is such a big fan of Crota he wants to die the same way. Bluerunner and random stranger Podvox help out Narcogen and Blackstar take out mini-Crota.
The quest for the exotic scout rifle, Touch of Malice, requires 45 calcified fragments be collected from the Dreadnaught. With only a few remaining, Narcogen recruits Blackstar, CortanaVIII and some randoms to collect one from Court of Oryx Tier 3 boss, Balwûr.
With the help of Cougron, Midnight and Freewill, Narcogen tracks down the quest path leading to the new exotic pulse rifle, No Time To Explain.
This video shows the collection of the cult ghost memory fragments from the heroic version of the Paradox story mission, as well as the special co-op and solo missions that are required for discovery of the weapon.