Helldivers 2's Cutting Edge Premium warbond, aka DLC battle pass, is now available to buy in-game, and it is chock-full of oddball gadgetry such as lightning shotguns, burst-fire laser rifles and experimental armour. As with the Arc Thrower stratagem, the lightning shotgun fires arcs of electricity that conduct between players and enemies alike, but there's a fresh armour perk, Electrical Conduit, which reduces arc damage by 95%, allowing close-knit teams of Helldivers to roll around the battlefield frazzling themselves without much penalty.
Still, I think the real star pick here is surely the Localization Confusion booster, which extends the time between enemy spawns, allowing weirdo solo players such as myself to disentangle from a dragged-out gunfight a little more gracefully.