Sith Slayer droid

A battle droid tank that possesses an organic brain inside. Crafted through Sith Alchemy which made them difficult and expensive to produce. Twelve meters in height, the Slayer possessed two shoulder mounted blaster cannons as well as a single spinning blades on both arms. As a result of the alchemy, they were more capable of shrugging off blows which the Sith's organic warbeasts lacked.

Source

 * Star Wars Gamer magazine