Oh ok, wow, I thought there was only a good and bad ending in Once in a Lifetime. Missed all those references in Eternum too.
Astaroth was a god who reincarnated in the body of the father in OiaL. The father was away from home most of the time. I forgot all the names already in OiaL, but he hadn't fucked the mother for a long time in OiaL. It's not unreasonable he had fathered other sons. If I remember correctly, he was a gangster too. Orion moved to Europe when he was small. He keeps having a dream. He is trying to find out the identity of the founder of Eternum, and he wants to take over his place by finding the gems. Something is adding up here.
Edit: I even forgot. They kept chanting "Esse Est Dio" in OiaL.