You might think this would be higher priority, but to actually do this you need very end game stuff. It's very simple, the multi armor's no clip ability can pass through the world borders. I stumbled upon this "bug" while flying around the border on the right side while trying to load as much of the map as I could if I ever needed a specific biome later on. I was able to hit mobs, but not break blocks on the other side. To my knowledge I am still the only person who has made an ATM star, but to even make the multi armor you need 4 in total.
