Arc cannon operators are probably the most ultimate badass soldiers of all the desert dwellers. Carrying a huge, battery powered heavy weapon ain't the safest duty in the world.
Extremely powerful, yet far more unstable than any other weapon, these guns have a chance to overheat, malfunction and even explode, wounding (or killing) the wielder. Having said that, arc cannons are capable of cutting through armor, flesh and bone alike, literally obliterating the enemy, no matter the cover. They are usually deployed in situations where raw takedown power is required against highly resilient or armoured enemies. And they do their job just fine.