The Abyss is a place unique amongst all other realms. It exists in the Third Dimension, but has beings of such twisted proportions and sizes that it is surprising that it does not exist in a higher plane. However, despite the monstrosities that exist there, arguably the most dangerous entity there was the Overmind. He had gone through many names throughout history, but that was the only name that he accepted as his own. He was the ruler of the Abyss, and Lieutenant of the King.