SHADOW KING

Farouk was first referred to as the Shadow King in Uncanny X-Men (1st series) #265. The Muir Island Saga first explored the idea that Farouk was merely the latest host of an ancient and independent entity known as the Shadow King. 

The Shadow King was incapacitated for years following the death of his physical body in X-Men (1st series) #117. He did not return until he possessed Karma in New Mutants (1st series) #30. Farouk was apparently destroyed again following the Muir Island Saga in Uncanny X-Men (1st series) #280, only to resurface during the Psi-War in X-Men (2nd series) #77-78. He was trapped inside Psylocke's subconscious for several years until escaping behind-the-scenes during the six month gap preceeding the X-Men Revolution event. In Uncanny X-Force (1st series) #34-35, the Shadow King was forcibly contained in the vessel of Omega White and imprisoned in the Starlight Citadel. He had escaped by Nightcrawler (4th series) #8.

Amahl Farouk was resurrected on Krakoa prior to Empyre: X-Men #2. He and the Shadow King presently exist independent of one another.

The Shadow King has suggested that he and several other malevolent forces (The Adversary, Annihilation, First Fallen, Goblyn Force, and Le Bete Noir) are all aspects of a single being. This remains unconfirmed.