The B8 supreme battle droid was considered to be the deadliest machine in the galaxy. It was created by Baktoid Combat Automata (BCA) like the other B-type droids. It was a secret prototype that was revealed near the end of the Clone Wars. It was 8.5 meters tall. After the B8 made its way into the battlefield, it killed 10,000 clones and 1 or 2 Jedi, before being killed by the Jedi Masters. General Grievous wanted to mass-produce the B8, but the BCA told him that it would be too much work. They announced that it would take 10 years to make 10 B8 units. General Grievous said instructed them to make ten units, but by the time the third unit was made, all the droids shut down and the BCA was no longer in existence.