It was to be fitted with the latest armoring and force-field technology, there was also to be a decent sized bloon construction bay at the back, Defence was created to protect those it was assigned to, however the price of the equipment made it tough to make as the bloon forces were low on resources after taking massive losses in war, making it completely impossible to finish the prototype being developed. So the blueprints and a half-complete prototype were abandoned... Forcefield: The effect lasts until Defence is destroyed, Attack gains an impenetrable forcefield.