History of Untethered Edge

Overview

Untethered Edge is a Legendary armor set from Episode: Echoes, available for Hunter, Titan and Warlock. Its flavour text covers conversations with Failsafe: Empress Caiatl on her invasion of Nessus, Saint-14 on emotions and the Witness, and Ikora Rey consoling the AI over Cayde-6. Piece descriptors include "Head to head", "Tighten your grip", "One breath" and "Set your stance".

Acquisition

Per Destinypedia, from Failsafe at the H.E.L.M. (via Echo Engrams), Breach Executable, Battleground: Echoes and Encore. After the season ended it is also reported to be available as a legendary package from the Monument to Seasons Past; one search summary said so, which I could not confirm on a page. Set bonuses were not covered by the sources opened.