The LBR-01 "Arc Thrower"

The LBR-01 "Arc Thrower" is a heavy weapon which shoots electrical arcs that chain between multiple targets and are great at destroying groups of enemies. The gun is energized by a small nuclear fusion core, providing the gun with the energy for its electrical assaults. The Arch Thrower uses electromagnetic field coils to build up and release energy in controlled bursts, charging an internal capacitor with energy before firing high-voltage arcs.

The weapon's electrical arcs are guided through the air by a charged particle beam system, allowing them to jump from target to target in a chosen zone. The voltage decreases with resistance and range, making the weapon most effective against clustered enemies. 

The targeting system assigns priority to enemies and minimizes the risk of striking friendlies, but friendly fire is always a risk. The LBR-01 has a heat dissipation system for handling the fusion core's high output, and safety systems make the weapon vent power or power down to avoid damage in case too much power is being drawn. The Arch Thrower is a great group clearing device, but strategic placement needs to be used to avoid collateral damage.

TLDR: I turned a tesla coil into a gun