Aura, why would a red moon, smaller than the original moon, appear?
I always thought that that moon was of the Dark Moon Dragon, in other words, Harle.
In the FMV, Harle pretty much jumps out, right next to the moon. Like Belthasar said, 5 stars and a moon represented the original Dragon Gods once they split. And till Harle was created, that moon came into being.
And didn't someone else say that that moon was the TD's or Harles anyway aswell?
And also, if you do notice Harle's techs, it'd be logical to think that the moon is her preresintation, since she uses it for every tech, especially Lunarteric.