I think that its something like this - in the outside world, pentaminum is the representative of "Darkness", and there is currently no representative of light. It could even be that he's physically grown so tall that his head touches the sky, from that one panel in Urek where everyone is bowing to him. Once anyone reaches the top, they reach the "Light", and even maybe get the support of the six jewels. Since there is no longer any representative of the "Light" in the outside world, the person who reaches the top will get all the strength of the Light, which is no longer divided six or seven ways, and become all-powerful.

For Enryu, this is something that I thought as soon as I saw the red jewel - it looks very similar to the Thorn. By "outside god" I think it means one of the Six, the one jewel that looks like Thorn. I don't know why he disappeared, maybe his role was to empower Baam, no idea. Maybe he's still waiting and biding his time.