Originally Posted by
some guy on discord
- After the end of F/GO 1 Nasu posted on his journal, releasing a bunch of information about the story. Relevantly in this case, he revealed that Flauros was the only Demon God who independently developed emotions early on, empathized with humanity and acknowledged them as enemies where the others did not (which is why he's constantly antagonizing you) and was the one of the Seventy-Two that had doubts in the plan and wanted Shielder's approval. He was the one who refused to give up at the end.- Flauros is the most important Demon God of the lot story-wise even discounting that, and last we see him in Salomon is still in a state of confusion about the choices humans and Heroic Spirits made, and Gilgamesh urges him to ask about it. According to Kirschtaria, the objective of the one from Chaldea was to investigate the humans of each Lostbelts. This doesn't seem to make much sense for Human King Goetia since he'd found the answer.
- Moonlight/Lostroom shows that someone came to the throne after the collapse of the Time Temple and picked up one of the Ten Rings that were left there.
- Kirschtaria mentions Lev shortly before the one from Chaldea appears to stop him. As a writer this seems to me like a way to nudge the reader's memories of a character that hasn't been mentioned in a while but is still relevant.
- The fact that he's called "from Chaldea" to begin with points toward Flauros rather than Goetia, since Goetia never even set foot in Chaldea, whereas Flauros was one of its creators.
- In the latest Lostbelt the one from Chaldea lists off the past Lostbelts and waves them away. At the start of the Time Temple, Flauros lists off the Singularities and laughs them off (except the Seventh, which he didn't find funny).
- The Human King seemingly shouldn't have the power to travel between Lostbelts, since Goetia had lost all his powers by that point. Also the one from Chaldea is explicitly not a Servant and Solomon/the Human King's body crumbled.