The Tank Droid Mark IV was a class of huge, bipedal and self-propelled droid tank that was used prior to and during the Jedi Civil War. It was heavily armed, carrying a rocket launcher, blaster cannons, a grenade launcher and a flamethrower within its blocky chassis. They were primarily used for facility defense against intruders, and although it gave an impressive first impression, the droid was ineffective against Jedi because of its sluggish reaction time and slow movement. After it had reactivated, the Jedi Exile and her party defeated such a droid that had laired within the hangar bay of the abandoned Telosian Military Base that resided underneath Restoration Zone RZ-0031 on the surface of Telos IV.