The Clone Wars
Manta droid subfighter-1-

Manta droids in action

The Manta Droid Subfighter was a large Separatist subfighter. It had powerful, dual barreled turrets that shot purple blasts. They saw action on Mon Calamari and the battle there. Jedi Kit Fisto aided the Mon Calamari Knights and destroyed many of them. The New Essential Guide to droids states that Xi Char engineers were commissioned to create these unique machines, but fell short when they failed to find a way to make it transform like their vulture droids. To compensate for this failure, the separatists were provided with free schematics for the Sub Carrier and speeder conversion kits to create the Mini-Sub.