I'm thinking the cogs (gears) will make the magic cars viable. They probably haven't thought to apply them there. They might just have direct magic power to rotation generator or something, and the drivers control the speed by changing the amount of mana they supply. But if there's gears...
I'm fairly sure that's actually the hole left behind by jupiter, after it got swallowed by the city and then converted into building materials. After all, the diameter is too specific of a number. Nearly the exact size of Jupiter.
I am really hoping that author is gonna pull a twist on expectations there and it is not a love triangle thing, and instead will be helping resolve Wakana's trauma. That will help him be more confident and probably help him in pursuing a relationship with Marin.
I always thought that since she's a daughter of a vampire and a human (dhampir), she's kinda a half-vampire by default. So she would probably just become a human instead of dying.
@gr8g that was just a question that Telomere had. That Bolt might be a clone of Leon....but it was never confirmed. This arc just instead confirms that it was the other way around. Leon was a clone of Bol or something along those lines. Not the other way around.
I am thinking this could solve some issues with the amount of magic in the worlds. If all three worlds get connected by Anima/Aqua Aera/something similar , the collective magic could get redistributed equally among all three worlds. Elentir would this way deal with the excess magic and Edolas...