Also, umibozu’s idea for how to kill Utsuro had a sound foundational reasoning. His wife died from being exposed to other planets Altana after all, becuase Altana is just a planets life force. So the life force of Kouan would be poisonous to someone who can only live using earths Altana
crystalblade13
2021-07-28 15:31:10 +0000 UTC
So there was a tinsy bit of cut explanation from the manga. Umibozu brought her several crystals, each to extend her life, but they were ultimately unable to prevent her death. So the crystal he used on Utsuro was the last one he gathered that he wasn’t able to give to her