Sandvein Lords: from Exile to Oasis Crown

(Witch + Elf + Dragon Girl +... Just comment on various types, they will be covered later) The time traveler Lin En was falsely accused of killing his brother and was exiled to the Cursed Desert. After awakening [Heart of Sand Vein], he discovered that a lost alchemical civilization was buried under the sand in this land of death. While other nobles competed for fertile territory, he quietly used alchemy to transform the sand into fertile soil, used magic machinery to drain underground rivers, and turned the cursed land into an oasis flowing with honey and milk. Until one day, the convoy of the imperial princess's escape from marriage accidentally entered his territory—— "Want to survive? Hand over all your food and weapons!" The refugee bandits shouted. Lin En chuckled and raised his hand. Three thousand alchemy puppets appeared in the sandstorm behind him: "Now, who should kneel down?" (Keywords: alchemy farming + desert infrastructure + behind-the-scenes mastermind + power struggle)