Exotic Quest: Shattered Memory Fragment (Pocket Infinity)

Follow these step-by-step to complete this quest:
 * 1) Find a "Damaged Ghost" on Venus' Shattered Coast on patrol
 * 2) Kill a Vex Gatelord to obtain a "Restored Ghost"
 * 3) Get fusion rifle schematics from the Speaker
 * 4) Dismantle 10 rare or higher quality fusion rifles
 * 5) Get an unstable prototype from the Gunsmith
 * 6) Kill 200 enemies with a fusion rifle in the Weekly Nightfall
 * 7) Bring it to the Gunsmith to claim your rewards