In the alternate universe NB-4755 there exist two seperate planes of existance, one artificial and one natural. During a massive universe wide war against the Satanic Empire, the Satanics detonated a quantum phase shift warhead, changing the laws of physics in the universe. As the bubble of the new universe spread throughout the fading old universe, the most advanced races built a goliath network of shields meant to hold out the invading universe. Most races were only able to shield their homeplanets or occasionally their home solar systems. One surprising exception is the Milky Way Shield World where the entire galaxy was shielded, albeit it takes vast majority of the galaxies power production just to keep the shield up.