Well, thanks to this very picture, I went ahead and did some research on what the flying fuck is Medjed. The results are on the wiki.
EDIT: Now more precise on the actual source for him.
Updated
Collector, Lord of Seeds, Lord of the Gods' Soul BakSebek
Another spelling for Sobek.Able to shoot beams from his eyes, his staple food is human hearts.
His name means "The One Who Strikes Down"God of the sky and sun, the supreme, the great diversifying god