This includes fantasy and sci-fi.
My choice is the Combine.
A multi-universal species from half-life so absolutely immense and powerful that they reverse-engineered earth's technology, upgraded far beyond human ability, brainwashed some humans and had them invade themselves. They did this and stomped all resistance within 7 hours. This was done by a backwater lesser combine city mind you.
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Edited by CeriseArt: 2/22/2015 10:31:33 PMThose Celestocians or what they're called from Ben 10(Alien X) Even though they can only do actions when all minds within them come to a unanimous agreement, they have the power to create or destroy entire realities