I'm a Noble on the Brink of Ruin, So I Might as Well Try Mastering Magic: Volume 4 by Nazuna Miki

After overcoming their first war, Liam’s reputation as Monster King spreads far and wide across the land, even sparking the interest of the grand and influential organization known as the church. The esteemed archbishop’s spontaneous visit and a problematic prince’s delegation bring a new set of problems, but not even politics and diplomacy can divert Liam’s attention from his passionate pursuit of magic. The surrounding human nations can only watch in bewilderment as Liam charges straight through the murky trenches of nation-building with the help of his loyal subjects, his trusty dragon partner, and of course, his bottomless creativity for magic and spells. From producing specialty goods to shaping terrain to even manipulating time—there’s never a dull moment when Liam’s still hungry for magic!