Medium Mass Driver Cannon A heavily armored slow firing weapon that delivers an explosive warhead deadly to armor, but only moderately affecting shields. Mass Drivers were considered an out-dated weapon when lasers were developed which easily melted away layers of armor. Over the years, ships began to sacrifice armor while focusing on stronger shields to prevent laser damage, a choice that allowed Mass Drivers to still cause destructive reign on unprotected hulls. A well timed salvo of mass driver could easily cleave a ship in two when the target's shields were broken down.