I forgot to bring this up but since I took it upon myself to post yet another bit of info about Old Ones, even Valusia has a term to tell of what they are. I can't recall if Sharnoth VN ever got into detail about it but I do remember something about them leaving Sharnoth when they found out about the "light of civilization" thing. Didn't bother to do it at the time either since I didn't try to look into it.
《ふるきもの》
あたたかなもの。遍く、世に充ちるもの。
世界に充ちる自然の顕現であり、無数の化身であり、現在ではかたちのないもの。
誰もそれを目にしたことはなく、彼らは遙か古代に体を失い、今はその残滓が声となって一部の《盟約》ある人々の耳に届くのだという。
砂漠の《盟約》の中心に位置する存在。
異邦人の碩学(学者)たちは「自然霊」「精霊」「古き神々」などと呼称し研究を行っているが、ヴァルーシア人にとって《ふるきもの》は《ふるきもの》であり、それ以外の何者でもない。ヴァルーシアの人々も、異形種の人々も、どちらも“神”という概念を持たないのである。
異形種は、人よりも《ふるきもの》に近い存在であり、尊い存在である──と太守ハールートは都市の人々へ公言している。
《Old Ones》
Warm things that filled the world everywhere.
They are manifestations of nature that filled the world, countless incarnations that are now formless.
They were disembodied in ancient times, and now remnants of their voice can only be heard by those part of a《Covanent》.
They are located in the center of the《Covanents》 desert.
Gentile Scholars have called them "Nature Spirits", "Spirits", "Old Gods", and so forth, and have come to study them. But to the Valusians, 《Old Ones》are《Old Ones》and nothing else. Neither the Valusians nor the Fantasy races have any concept of "God".
Fantasy races are closer to《Old Ones》than normal humans, and are precious beings──that is what viceroy Harut proposed to the people of the city.
-Source:
Valusia Glossary (Official Blog)
@Celestial_Pegasus It's pretty realistic considering it does show how humanity IRL has gone from telling about myths and legends to explain stuff in the world to using science to do so instead. That gives me the impression of what "light of civilization" is referring to. It's sad for beings like this to be gone, but that is how the world works.
@RM97 This is all I got if you wanted more info.