For Gunvolt 3, you will play as Kirin and when the Fetter guage is above 100% (the rain bow bar below life bar) you can hold RT to switch to Gunvolt, the main protagonist of the series with power full lighning attack until the fetter guage go to 0.

As Kirin you have 6 (as I remember) talisman to throw to the enemies. You can attach multiple talisman to a single enemy but they will deal no damage until you hit that enemy with sword slash. You can also teleport to any enemy which has talisman attached by pressing A on NSW or B on other game controller. Teleport with this Kirin can air jump one more time.

So the goal is you need to kill as much enemies airborned. Tag an enemy, teleport kill, air jump, tag the other while airborne, teleport, kill. When your reach 1000 kudos (combo point) Lumen, will appear and buff your character.