The sinking of Lalakie back into the sea after the defeat of the sea lord seem wasteful it was the center of a flying nation sure returning Lalagi or ishrallie even Noolie to the sky maybe a bad idea as the first two are functioning kingdom that may repeat the crime of the original skyfolk and Noolie is a grave sight but Lalakie was most likely evacuated before the sealing the sea lord true Reiane mother and aunt dead in that battle but it a treasure trove of technology and history. maybe this is because I'm also a In Another World with my Smartphone and Satou using Lalakie like Touya uses Babylon sounds good to me plus as the gods gave the Skyfolk these flying cities they can't get on Satou case they way they did Yoroi or Muruko. Lalakie could be a secret base, storehouse, research lab and vacation home plus an evacuation center maybe another place for the orcs to call home