The absolute terror:
You could see all the souls of all the people he had absorbed....
This was my favorite part of the saga in some ways. lol
Also, there's something to be said a bout a villain showing up and not immediately being the strongest. He had to slither around and wait in the shadows. Even retreating when necessary to build up power to accomplish his mission. His background and origin story was actually well thought out. And what a blindside that was when he turned out to be the true big bad after trunks warns us about the "two dangerous androids". My favorite saga overall ^_^