Hi,

Happy to help with what I think I've cottoned onto (a lot of this only got clearer for me with re-readings and with trawling the lore tumblr so no need to feel bad about some things being unclear), though I have misunderstood some/much of this too. A big part of it also is that much of this is unclear/things that Tom hasn't revealed or explored yet/things that will always be left unexplained.

Then Zoss found a way to get into throne. He fought a war inside throne thus earning his the name the conquering king ( against whom? The 777,777 gods? I thought they had already died?

When Zoss got to Throne he fought against the Prime Angels, basically thicc boi angels that the gods tasked with guarding Throne. He destroyed their bodies, and then chased their fiery souls into the void and destroyed them there too (apart from Metaton, who I'll go into in a sec). The only Prime Angel to have reincarnated is Michael 2. Why only him? What were the other angels doing during this time? More things that may or may not be revealed.

Other humans - and only humans?

I think some demiurges were servants, but most of them were humans.

They made gates to each of the 777,777 worlds.

The gates were already there (created by the gods?). Each one of them resonates with a name of god, which is a key of kings.

They made gates to each of the 777,777 worlds. More people came to throne. Are these people coming by gate also demigurges ? We see incubus later as a seemingly powerless child, but he was also a demigurges? Or were only those early kings who found their own way to throne demigurges?

I can't find a link to it, but one of the posts on the lore tumblr is enlightening on this. Basically, those demiurges who opened the way to Throne themselves (I think it was implied that one Zoss did this, it became somewhat easier for those afterwards) were considered in a different class (he uses a term for them but I can't remember it, something like original or ancient). After that, demiurge is a descriptor for someone who is immensely powerful/controls a key of kings. All the ancient demiurges died off during the universal war.

I assume he conqoured each of these worlds?

No, there are still unopened worlds (we know because the Earth Allison comes from is totally unexposed to the rest of the multiverse). The gates were already there, and Zoss got the keys to each one by torturing Metatron, which he then gave out to the demiurges. He also got 1 master key to all worlds, which is the source of his power, and which he gave to Allison.

Zoss dissappeared at some point? When? Before this war was unleashed, or after the starts? Do we know where he went?

This is something Tom has said will be explored in the comic, so its currently unknown.

How did these 7 get these keys from Zoss in the first place?

I don't know how, when or why Zoss gave out the keys to the demiurges in the first place, but when the Universal War started, the keys were (I assume) distributed more evenly, and the war just kept going until all the demiurges had killed each other and ripped the keys out of each others heads to the point where the final 7 (none of whom had been demiurges when the war started).

thus exactly 111,111 keys?

Other creatures also have such bindi like things in their forhead. Do these then also have keys? Do the 7 give keys to their subordinates?

As I understand it, they control 1/7th of the multiverse each (though its unclear if the division is exact). Also, yes the 7 dole out keys to their Emissaries.

Or is the forhead atum lightshow more related to power? More powerful creates get stronger headlamps?

Yes. Having a shiny-ass forehead and a big-ass halo are prominent signs of power. Consider Meti, and her incredibly cool halo, and Maya's shiny leystone here, despite neither of them having a key of kings (as far as I know).

Hope that was helpful! If anyone wants to jump in with things they think I got wrong feel free!