As I mentioned before, Three Worlds refer to Three Locations,
Similar to Enies Lobby/Marineford/Impel Down or Skypiea/Birka/Shandia or Elbaph's Three Levels,
In Harley They are mentioned as "Within Earth" + "Within Void" + "Within Chaos",
Harley Text isn't about teaching History, it's a Prophecy, so it needs to Start with Events,
It's not going to describe these Locations, what defines them is Events that will happen in them,
This means:
"Within Earth, there was Fire" indicate Problem 1 (Fire) that Reveals to us First Location,
And which Location was recently said to be in a Sea of Flames? Mary Geoise.
Not only Confirming First World, but it also Confirms that First Lines speak of Problems indeed,
This means "Within Void, there was Breath" speaks of Problem 2 in Second Location,
And "Within Chaos, there was Emptiness" speaks of Problem 3 in Third Location,
If I'm right, then Harley should mention Six more Similar Problems,
How do We spot them? They need to be Events mentioned that aren't Resolved within Harley,
For example, it says "Man Killed Sun & became God", means it's gonna happen, it's not a Problem that needs to be Stopped, Someone will indeed Die anyway, but when it says "Sea God Stormed" & that's it, then that's an Unresolved Problem, and We can add it to the List,
In Harley Text, these Nine Problems are teased:
1. Who's gonna Stop "Fire"?
2. Who's gonna Stop "Breath"? (Whatever It is)
3. Who's gonna Stop "Emptiness"? (Whatever It is)
4. Who's gonna Stop "Earth God's Rage"?
5. Who's gonna Stop "Serpent of Hellfire"?
6. Who's gonna Stop "Forest God's Demons"?
7. Who's gonna Stop "War triggered by Sun"?
8. Who's gonna Stop "Sea God's Storm"?
9. Who's gonna Stop "Sun God guiding World to it's End"?
Matching them with Onigashima Nine Problem & it's Foreshadowing would require much Deeper Analysis, which I'm not going to write here, I will just wait till 2 or 3 more Problems show up & everything will become Clearer for everyone.