The Game Master

The Game Master is a Callow Fear that unlike the others has servants called Emissaries. It also has a domain known as the Board. The Game Master has been confirmed by the SCP Foundation to have been a "man made godly through the Thirteen" heavily implying that he used to be human. He is the fear of Victory and more specifically winning by hurting those you love. He often likes making people play in his little chess games, forcing people to kill each other.

It's also suspected that he wants to bring the great game back to it's original glory.