Clench

A vehicle of terrifying power and pure evil. Combines a keen brain with diabolical cruelty. His whole being is dedicated to vengeance. A nightmare opponent, powered by pure hate and the thought of ultimate victory. Overwhelms, flattens and throws aside anyone foolish enough to get in his way. As a vehicle attacks from all sides with vast weapon power and does terrible damage with his vicious, rear mounted grabbing claw. Menacing in intermediate mode as a multi-purpose battle station. As a gigantic robot, towers terrifyingly above all.

Obliterators backstory (used for both Autobot Pyro and the Decepticon Clench):

The Autobot and Decepticon troops still face each other over the devastated wastes of their age old battlefield. But now there is a new dimension to their endless contest - the Obliterators. Looming menacingly out of the mist come two towering warriors, both with super rapid firing missiles. The Autobot champion, Pyro, gives courage to his loyal followers and strikes terror into every Decepticon heart. Squaring up to his strength is the vast Clench - the pride of the Decepticon ranks.

So evenly matched are their amazing powers and astounding might that surely no-one can win this struggle? But someone must...