Setback

Abstract
One of the oldest, if not the oldest Corrupticon on record, Setback's identity prior to his re-forging is as ambiguous and confusing as his shifting shape. One thing is clear however: he relishes in what he became. Ruthless and power hungry, Setback is counted as Unicron's most trusted servant and has thus amassed a truly terrifying amount of power. And when it comes to utilizing his powers, Setback has proven to be both shrewdly pragmatic and flamboyantly dramatic. If he wants to kill someone, he could do it in moments, snuffing his target out with a viciousness that would make a Decepticon seem pleasant. But Setback adores flaunting his might. For him, the impression he makes on his foes is just as important as the kill itself. The fear in his foes' optics as they realize who and what they are dealing with is something he revels in. The more terrified the reaction, the more he is tempted to flaunt further in order to savor it."'Tremble and fear me! I am your undoing! I am chaos! I am death!'"

Nature of the Beast
Setback was one of the first Corrupticons to make himself known to the Autobot forces, and admitted he and his cohort Malice had been observing them and the Decepticons stranded there ever since their respective arrivals.