Well, I have been wondering, is Rarohenga the real name for the 11th world?
From the story it seems that this is the world which Hotupa visit earlier in the game.
If I'm not mistaken, it's the world where technologies had advanced so much that its people don't fear the One King because they already had developed a method to fight him (while other worlds only depend on sacrificing 108 stars). So much that they won't share the method with our Hero =(.
Later in the game, the 11th world came in with its Chronicle and High-tech Creepy monsters. After the chancellor showed Hero the Chronicle - a High-tech World with a sphere-shaped device, presumably it's their method to defeat the One King. Unfortunately, the device exploded, caused millions of death in that world, so much that it altered the world, its remains (the altered monsters) and/or its chronicle to Rarohenga summoned into our Hero's world. Even the massive crater from the explosion is still there. (Notice that there are several of them.)
Despite the tragic failure of that world, I really like its development.
"Heh... screw you for your over-confidence."
Other reference to this world is Balsam's mentor, Rufa, and Zayin. Wonder how Rufa and Zayin stays unaltered too and how Rarohenga looked like before the annihilation. The present landscape seems so tragic, its landscape screams death in every way, much, much more than Janam, Other Cynas, or even any landscape I've seen in any fantasy games.