The Titan

The Titan was known as the strongest and commonly revered as an undefeatable demon of overwhelming strength.

History
Little is known about The Titan which was introduced in Doom (2016). One of the only references to The Titan can be found in The Titans Realm where the skeleton of the deceased titan can be found. The Titan is reportedly the largest demon in existence and was defeated by the Doom Slayer in an earlier age.