Y2 Icebreaker quest found while running Crota. Steps below
Sea of purple- Spawn 20 heavy amo drops in under a minute.
Green with envy. Land 20 sniper shots in crucible without picking up a special amo crate.
Photosynthesis- kill a strike boss without moving or picking up additional amo.
Breaking the Ice- Dance in front of Xur for the duration of Vanilla Ice's Hit song "Ice Ice Baby"
Clearly I don't have it yet but come Friday I will never use another exotic ever again.
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Pfffff I do that daily with my eyes closed especially the vanilla ice part ಠ_ಠ