Steps
1. Talk to Ikora Rey to obtain A Request from Ikora Rey Part I.
2. Complete a total of 5 Strikes without dying to obtain A Request from Ikora Rey - Completed. Note: The 5 strikes do not have to be consecutive.
3. Return to Ikora Rey to obtain A Request from Ikora Rey Part II.
4. Earn a Kills/Death spread of 25 in the Crucible to obtain A Request from Ikora Rey II - Completed. Note: A kill or assist is +1 point and a death is -1 points. Earn a total of 25 points. This can be done across multiple Crucible games.
5. Return to Ikora Rey to obtain A Request from Ikora Rey Part III.
6. Complete a weekly challenge mission (Weekly Heroic or Nightfall Strike) to obtain A Clot of Darkness.
7. Return to Ikora Rey to obtain Invective [Uncharged].
8. Purchase an Invective component from the Gunsmith for 50 special weapon ammo packs to obtain Invective [Charged]. This will cost a total of 12,500 Glimmer.
9. Return to Ikora Rey to finally obtain Invective.