thing is it sort of gave me ff7 vibe in ff7 there were the anciants(aeriths race) who were the closest to the planet which gave them the ability to use magic. then later on jenova comes and the planet saw jenova as a threat which drove the anciants mad in a bid to kill jenova. anciants pretty much all died but a few (aeriths family) who were to young at the time to really fight. reminds me a lot of amuarotine and the sound the sound could be the planet senseing a threat to itself and the terminus could have been a defense mechanism to fight that threat. that could be an alien race landing on the planet (middy and the eggs maybe?) or it could be that the amuarotines were somehow harming the planet without realising.