Not (Just) a Mage Lord Isekai, 2

Perry survived his first trials as a Magus Dominus. Now comes the hard part. As refugees pour in and storms threaten to shatter everything he has built, Perry races to strengthen his territory before disaster strikes. Together with his companions, he must tame the skies and depths alike. And having already built an experimental glider, he and his friend, the Forgeborn Inertia, set to building a proper airship. But while Perry reaches for the skies, secrets buried beneath his domain begin to surface. Deep underground lies the legacy of the Magus Dominus who ruled before him: a forgotten facility, forbidden research, and a mad mage who has spent years locked away. To survive the storm, Perry's going to need every scrap of magic he can get.