Scourge

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He is a ferocious but patient killer who makes sure that all who oppose him or his master will die, and his body is covered with insignias claimed as grisly trophies of his many kills. However, make no mistake, Scourge is Unicron's servant, and any failure on his part is immediately punished with extreme pain. It is a testament to Scourge's skill that he rarely fails.
He's often portrayed as an arrogant ruthless, cunning, treacherous and cruel character with great plans.