Here is an image i made for Will Doyle and his D&D website Beholderpie , I used to work with Will At Frontier, Will has since moved on from Frontier, but during that time we both worked on the open world game The Outsider and the magical Kinect Disneyland Adventures
For the image Will has kindly let me use the words he has written about the skull . its a great piece of writing i really like it and is entitled Methragor's Skull
Methragor the Red was famed for his mastery over humankind. Though young, his path to power was carved by an immense network of spies, robbers and assassins, many of whom had no idea they were working for a dragon. Methragor's Machiavellian schemes made him a deadly adversary, but it was his cruelty that finally brought him to the attention of Orcus, Demon Prince of Undeath. The dragon's penchant for periodically eating his most favoured servants appealed to the demigod, who offered him lichdom in return for undying service.
Stripped of his earthly body, Methragor now appears as nothing more than a jawless dragon skull. Such appearances are deceptive though, for in death as in life, Methragor relies on his puppets. When the dragon's skull is worn as a helmet, Methragor immolates his victim and raises their body as an undead vessel for his mind. In battle he surrounds himself with devout orcish warriors, each one sworn to sacrifice their body should his current vessel fail him.
Today Methragor serves Orcus, but his scheming ways are far from over. He longs for a way of escaping his servitude; and with an eternity to plot, remains confident he shall someday find one....