Dungeon core

One day, the world changed. With a flash of light enveloping the planet, the system goes live. Unknown to humanity, we've just rejoined the galaxies automated balancing system. People are changed into new races to maintain the balance, you fortunately become a dungeon core with the option to build your dungeon wherever or however you want. Modern weapons, inventions and armor are made useless under the system making dungeons like you precious materials to the world, preventing your destruction as you do as you please to grow.