A point i occasionally bring up is that a meta plot point in the story is the destruction of the red line. Since imu seems to need to be at the red line to live then maybe this meta plot point has been about killing imu all along.
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Welp..for sure,,, he cant leave Mariejois for long,, i would love to know why...i also wonder if he is actively triying to find a way to solve,, and that might be related to ancient TECH,, or it just an issue of more hunger for POWER,, as mother flame is probably to fuel.. whateaver the hell Destroyed Lulusia's... indefinitively....
on any case, big part of the plan is yet,,being prepared by Sunk the whole daam world again,, the reasons of the, "Alcoholic bridges" like Tequila WOLF etc,, it is impreparation to Link mariejois to whateaver the hell resources left once the sea rise up and most of the world drown ... the red Line on any case being so high might be the very few places standing--, another blank century might be on the rise if things doesn't fully work out for them,,,
if they are prepared to a huge rise of the sea,, it is cause they are goin to use THE HELL OUT OF the weapon they used in Lulusia's and every island that get vaporized,, is goin to rise it even more..