After the B-1 battle droid and the B-2 Super battle droid came the highly improved B-3 Ultra battle droid, which struck fear into the republic.

The B-3 unit was far larger and bulkier than the B-2 unit, and had significantly more armor plating. On top of that, it boasted a flamethrower, plasma cannons, the standard blaster cannons, and even a missile launcher stored in it’s left shoulder.

To top it off, the B-3 unit featured a density project, which allowed it to increase it’s own weight by up to 20 times, making it almost impossible to topple over.

The B3 ultra battle droid was based on the B2 super battle droid model, though it was far larger and bulkier than the B2, and boasted more substantial armor. The B3 had two large primary arms: the right arm, containing a tight-spray flamethrower; and the left arm housing a wide-spray plasma cannon. Two smaller secondary arms, located underneath the primary limbs, featured deadly rapid-fire forearm blaster cannons, similar to the B2 battle droid.

Built into the droid’s left shoulder was a missile launcher containing brilliant missiles, capable of highly sofisticated target acquisition and tracking. The design also featured a Density projector, a device capable of increasing the droid’s weight twenty-fold. This enabled it to lock itself in place and made it nearly impossible to topple over, counteracting the droid’s high center of gravity, although doing so would make it an easier target for Republic heavy weapons.