History of Riskrunner

Riskrunner is an Exotic Submachine Gun that deals Arc damage. It is a 900 rounds-per-minute weapon with low impact and good stability.

Overview

Its intrinsic perk, Arc Conductor, makes the weapon more powerful and gives it Arc damage resistance while you are taking Arc damage, for example from Fallen enemies or Arc grenades. Kills extend the overcharged state. While Arc Conductor is active, its Superconductor trait lets shots become chain lightning that returns ammo to the magazine, which makes it strong at clearing groups.

Acquisition

• The A Spark of Hope questline (seven parts, starting with Commander Zavala in the Tower, with steps involving Ikora Rey, Devrim Kay and Lost Sectors in the European Dead Zone) ends with the "Risk/Reward" mission in the Cosmodrome and rewards Riskrunner.
• Exotic engrams and extremely rare world drops.
• Destinypedia also lists it as a choice reward (with Graviton Lance and Sunshot) after the story mission "Sacrilege" and via the New Light quest "Pain and Gain". These are older sources and the current availability of those routes was not confirmed.

Catalyst

The Riskrunner catalyst adds +27 range and, per the guides, a stronger Superconductor effect. Sources disagree on the unlock: one guide says the catalyst comes with the weapon and needs 600 kills (300 regular, 300 chain lightning), another (search summary of a Game Rant-era guide) lists 500 kills and 50 chain lightning kills. Check the in-game Triumphs under Exotic catalysts for the current requirement.