Take a Building with You

Traveling through the magically modified parallel world, I still carry the building I lived in in my previous life in my mind. But is there any use in using a building to hit someone? This magically modified world is invaded by various alien worlds. Magic, sorcery, orcs, and mechanical corps all fly up to destroy the world. Wait, what are you talking about? My earth is at the end of the world, and treasures are still born? (No tricks, no slaps in the face, use earth's magical treasures to fight against other worlds, try 10 chapters, it's absolutely novel) (Tags: nostalgia, time and space, apocalypse, Lilliput, treasure picking, invasion of other worlds)