The Most Powerful Villain Army in Comics/movies/books

Darkseid's Parademon after capturing Superman and taking his DNA and giving to the Parademons. This made the parademons almost make like Superman.

Also wanna throw out the D.R.A.G.M.A. from Godzilla: The Series (because I've been binging it). They reduced the US population to a few thousand and killed all other Kaiju on the planet. They also adapt to whatever they're attacked with, so think of them as an army of flying Triceratopsian Doomsdays.

The Beyonders murdered the Marvel multiverse, including the Living Tribunal