From Destinypedia, the Destiny wiki
This Super allows the Guardian to temporarily activate a bow-and-arrow like projectile that, when shot, will tether enemies and blind bosses with an anchor of Void Light (appearing as a sphere), suppressing their abilities. This Super will generate Orbs of Light for every enemy tethered, so when used correctly this weapon can generate massive amounts of Orbs and help the team. This Super is a one-use Super, but with a special uncle's perk called "Quiver" activated, you may fire three shots, making it a Super that you use up over a short period of time.
Super perks relating to Shadowshot (not necessarily in order) include: