I no longer think that the story (the universe in which lona lives) is created by justice, instead I think justice is just a conqueror of the multiverse and has the power to change some aspects ( not the whole plot but changing the happenings in the universe like changing the past) what I found from the plot of the pseudo-God-slayer, the female priest at the monastery about 4000 years ago the point where the fake god landed, creating countless terrifying forces, or in the talk of fortune-tellers, justice, and sea gods about error correction and if justice is really the one who changes and creates, then he must change the reality that no one has ever fought against or witnessed him create terrifying forces, but in history about lona worldis seem have false god slayer have fight with he and some pries has react he create monster to recorded in history of saint, saint in lona world used to be unreliable but i was sure they were trustworthy when saint moutain monasery came out, the priests, the priests are all real. maybe the real plot is only eccma controlling them and justice is just changing the past in universe where can change the future like how he wants lona to gradually return to sybaris instead of leaving the island like you said