Board Thread:4. General Discussion/@comment-124.83.16.225-20160127164816/@comment-124.83.16.225-20160213145537

No, Demigods become Fallen Gods when they don't have enough Divine Power to maintain their Demigod status. That's exactly how they become Fallen Gods. If there are any other methods for this to happen stated in the story, I don't know of it. This is why the Reincarnation God said that the gods who looked into Rou were worried for their own survival, because becoming a Fallen God is the worst thing that could happen to them.

If what you meant by "these conditions" is Rou stealing dungeons and killing heroes (that is, being defeated in an Eschatology Battle; gods don't fight each other, their heroes/divine power investments do and the winner takes the divine power that belongs to the loser): that's exactly what the Reincarnation God said could happen to the gods Rou does that too. It's right in the part I quoted from the original text.

Lots of the gods actually DO think they're in danger. A blessing from one of the Great Gods isn't something they take lightly at all.