Is this an exotic quest?
https://twitter.com/imaginedsnake/status/643816296472256512
If it is I think it's the chaperone because I picked it up from Amanda Holiday, and her mom is the one that used the chaperone.
Edit: this actually kinda hard because I am ass in crucible with the last word (I prefer pulse rifles) and you have get 3+ kills without dying for it to count, and every time you die it sets you back a lot! definitely not going to be for everyone!
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I finished ttk story but my warlock never did finish the whole story of destiny, tdb, and HoW. It didn't show up.