@Sigma then ... "c" is probably the monstrosity that was on the mural in the old civilisation church which is I think is chaos... not like his summoned subordinate but something like demon king demise from skyward sword zelda ... Then ..why does it attack people after civilisation reaches a certain point ... I think it works like the entities from worm G**-like beings that are driven to reach a certain "something " that they choose a planet to consume and revitalise over and over again....  Except this time something new appears...  [Unlimited Gacha] is a "gift" that brings people and items from other worlds... specifically parallel worlds to this one it brings "out of context" things into that world in exchange for mana ...  And I think the {divine spear (shinto burial gungnir )} is one of these worlds answer to end either chaos or a being like him

Ah. I think I understand the story details a bit from this chapter. The guys who conspire...