How to Get Destiny 2 Regnant Grenade Launcher. Regnant is a Void energy, Adaptive frame Grenade Launcher. To get Regnant in Destiny 2, players will need to own Season of Defiance and complete the “Awaken, Queensguard” mission. This will open up the Seasonal Playlist, Defiant Battlegrounds, which drops all of the Season of Defiance weapons including Regnant. Defiant Battlegrounds have a chance to drop Regnant or another Defiant weapon or Armor Piece. You can use a Defiant Key to also get a Resonant version of Defiant weapons as well. The Defiant Battlegrounds playlist is found on the HELM.