We Agreed to Summon Heroes, but How Come We Got an Engineer?

We agreed to summon the brave, but why did a mechanical engineer wearing work clothes and talking about torque and energy efficiency come out of the magic circle? When Arya, the princess of the Kingdom of Rennes, chanted an ancient mantra, hoping for a legendary warrior who could wield the holy sword, she never expected that the one who would answer the call would be Lin Fan from the modern world - a technical geek who believed that "the plan is not enough, so hydraulics will make it up". Facing the empire's overwhelming steel torrent and human sea tactics, what Lin Fan saw was a new world that perfectly combined magic and materials science and was in urgent need of technological innovation. The alchemy puppet can only charge with a sword? Combined with magic muscles in parallel, it becomes a powerful "bulldozer" that can ruthlessly crush all fronts. Gryphon knights dominate the sky? Cheap reconnaissance and bombing drone swarms will use "swarm" tactics to teach them what air superiority is. Thus, a technological revolution in a strange world began. While the empire's generals were still struggling with how to deal with yesterday's inventions, Lin Fan's engineering department had already launched the next generation of products. From the silly, black and thick construction machinery to the flying battleships soaring into the sky, Lin Fan told everyone with drawings, assembly lines and: Knowledge is the strongest power