Another idea stolen from Dragonball Multiverse. Gast Carcolh is a fusion of the remaining Namekians who possesses essentially god-like power.

http://dragonballmultiverse.wikia.co...h_(Universe_7)

Anyway, disappointing that a fusion composed of the entire Namekian race was not even stronger than Gohan and Piccolo. I imagine none of them were very strong to begin with.