Following the yes or no format, to avoid being 'cheap' and/or preventing Forrest from providing answers.
1)Is he(by which i mean was he, is he simultaneously, is his body, etc.) someone whom we've met or heard of(not including anybody exclusively in GURPS)? (just double checking)
2)Is the head a he?
3)Is/was the head human(excluding gods or dieties, just to clarify)?
4)Was he ever a leveller(or leveler, if that's how u spell it) or savior?
5)Was he ever (or is he, to cover all the bases) an archmage, Fallen Lord(applying the term used for Balor's direct subordinates to all subordinates of a Leveller), or member of the Nine?
6)Was he ever mentioned, or did he ever appear, in Myth 2, aside from references by the narrator or the journal to him (unless it referred to him as an entity other than 'the head' or any deriative thereof)?
7)Is the head a god, demigod, or some other supernatural or 'superior' being?
I still have 13 questions, but I'll use them later:)