The Raiden Flux is an Exotic Gear Piece for Hunters in Destiny 2.
It’s rewarded automatically for the main mission “Riptide” on moon Titan if you’re playing a Hunter. After the mission you must speak with Sloane and can pick one of three exotics.
Exotic Name: Raiden Flux
Type: Chest Armor
Required Level: 4
Item Description: Interfaces with synapses (or nearest equivalent) to draw electric power directly from the wearer’s body.
Special Ability #1: Synapse Junctions — Quick successive attacks with Arc Staff increase its damage output and duration.
Special Ability #2: Class abilities recharge faster when using an Arc subclass.
Acquired by: Beat the ‘Riptide’ main mission on Titan moon and you can pick it as a quest reward from Sloane (Hunter only).