There can only be one!
How about a Parthanon of sorts, but based more on what the premis of DG is in the first place: 4 vs 4 Demigods in the first game (Large map). The lowest scorer on each side is removed. Then a 3v3 (medium or large map). Again, the 2 lowest removed. 2v2 (medium or small map). Then a 1v1 (small map of course), to become the GOD! Exactly like the story for the game. . .