Originaly a soldier of the CIS during the Clone Wars, OOM-7 was destroyed by Halas Kad on Dantooine. After the war Halas Kad reterned to Dantooine and rebuilt OOM-7. OOM-7 was so damaged that Halas had to order new B1s and remove parts from them to rebuild the dammaged droid. Now nicknamed Zau, OOM-7 travels with Halas as a loyal companion onboard the FMS Bone Crusher.