Apocalypse: More Children, More Blessings, and a War Fortress from the Start

[Apocalyptic high-martial world + awakened talents + awesome mechs + more children, more blessings + a tangled romantic battlefield + multiple heroines] From the start, I have nothing but a dilapidated tent, and my wife is the camp's only God of War, though she's gravely wounded and on the brink of death. Bound to the [Humanity Revival System], I can save her, but only if I have children! Have one child, and I earn an iron fortress! Have two, and the fortress upgrades into a floating stronghold! Have three, and I unlock the armament of a star-destroyer! But the stronger the children, the more of my life force they drain during pregnancy! Wasteland tent → Tier One Refined Iron Fortress → Self-Propelled War Stronghold → Celestial City in Space! F-rank frail physique → E-rank extraordinary body → A-rank genetic-lock warrior → SSS-rank progenitor of humanity! When my old enemies arrive with their men, shouting that they're going to take my fortress and my woman, I hold my child in my arms atop a hundred-meter-tall alloy wall, with countless cannons roaring behind me. “Tell your men to look up.” “From today on, I make the rules.” “I decree: nothing living may fly across the sky!”