I Googled (or rather, Yandexed) "Conflux of Spheres."
I like Illet's album "Conflux of Spheres"; it includes a song with the same name, but I couldn't find the lyrics. It's clear that it's somehow related to the Middle Ages. How exactly – I don't know. I also don't know who among us to connect it to. Keep digging =)

What Kostya is suggesting on Nairu seems like nonsense to me =). It's like Lizard Baboons (or whoever they were)).
What the adventurer suggested can be considered again. But I think that the Chief Illuminator checked the Fortress, so he shouldn't be the killer...
I still think that Kyle killed Mold.
I have no ideas about who killed Kyle.
For now, NNV.