I Built an Earthly Fortress That Terrifies the Entire Universe

I just don't get it. Why is Earth always being invaded? Can't we defeat other civilizations before they invade us?

After transmigrating to a post-apocalyptic Earth, Jiang Feng sets out to prevent another invasion. He develops technology, nurtures talent, revives the ancient body-refining civilization, and turns Earth into the strongest fortress!

What? There's a technological civilization up ahead? Use the sun as a cannonball and blast them to smithereens!

What? There's an eldritch civilization up ahead? Send in the Cthulhu army and enslave them!

What? There's a magical civilization up ahead? Send Voldemort's army to crush them!

What? There's a civilization of goddesses up ahead? Jiang Feng will go conquer them himself!

What? There's the highest civilization in the universe up ahead? Then we'll wipe it out too!

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.