A Dubious Task

"The Warlock Vanguard, Ikora Rey, left a posting here - signed, handwritten, and asking for you."

- In-game description

A Dubious Task is an exotic weapon bounty that ultimately rewarded the exotic shotgun Invective. The bounty could be obtained from the Vanguard Mentor Missive, but was made unavailable in Destiny: The Taken King.

Tasks

 * 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.
 * 3) *The 5 strikes do not have to be consecutive.
 * 4) Return to Ikora Rey to obtain A Request from Ikora Rey Part II.
 * 5) Earn a Kills/Death spread of 25 in the Crucible to obtain A Request from Ikora Rey II - Completed.
 * 6) *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.
 * 7) Return to Ikora Rey to obtain A Request from Ikora Rey Part III.
 * 8) Complete a weekly challenge mission (Weekly Heroic or Nightfall Strike) to obtain A Clot of Darkness.
 * 9) Return to Ikora Rey to obtain Invective [Uncharged].
 * 10) Purchase an Invective component from the Gunsmith for 50 special weapon ammo packs to obtain Invective [Charged].
 * 11) *This will cost 12,500 Glimmer from Banshee-44 or 50 Ether Seeds and 5000 Glimmer from Variks.
 * 12) Return to Ikora Rey to finally obtain Invective.