Posshexor

For a century humanity has fought a bloody war against the evil forces of the Necronomicon Ex Mortis, the Book of the Dead, but now, miraculously, it has been captured and finally the war won...

...Until you read one of its pages and it all went back to hell. Nice one.
Now hexed with powers of possession, you must re-vanquish your path into the begotten depths of hell, cursing your soul with every step taken to once and for all, catch and destroy the Necronomicon Ex Mortis!