The Abyss Is Invading? I'll Hand the Ten-Thousand-Soul Banner Over to the State

[National fate + planar war + middleman between two worlds + handing everything over to the state + demonic sect patriarch + demonic cultivators save the world] What if heroes who died in battle never left, but simply changed battlefields? Qin Feng transmigrates to a cultivation world in the Age of Declining Dharma and accidentally activates a two-way altar connected to an Earth under invasion from the Abyss. To save his sister and China, he uses abandoned forbidden spells from the cultivation world to blast Abyssal lords, feeds starving demonic cultivators with Abyssal demon flesh, and uses industrial technology to rebuild ruined sects. But what truly changes everything is neither forbidden spells nor magical treasures. It is the souls who refuse to fade, even after falling in battle. On the northwestern defense line, the battered souls of the Third Company still hold their battle formation, their bodies reduced to specks of light. In the depths of the East China Sea, the loyal spirits of sailors who sank a century ago hear the call and return to the ranks. 81192, nameless martyrs, border guards who died in the line of duty... They have never retreated. Qin Feng forges divine cores for them, outfits them in demonic armor, and builds a Hall of Heroes. From then on, the Abyss no longer faces a mortal army, but immortal battle spirits piloting divine-demonic mechs. The Abyss Wardens return to duty. The Zhiyuan sets sail, with the Monument to the People's Heroes serving as its soul. When the gods of the Abyss look down upon the mortal world, Qin Feng asks just one question: “Have you ever seen a warship set alight by the will of 1.4 billion people?” And the unsinkable Zhiyuan has already charged toward the gates of the Abyss.