This type of round is very similar to a HEAT. Instead of an explosive to push the molten slag, it uses a nuclear blast. When the sensors touch the armor, it sends an electric signal to the explosive charge, pushing the uranium pieces against each other. Once that occurs, a fission reaction will instantly take place. The sudden high pressure inside pushes the osmium slag out at temperatures of around 5-10 million degrees Celsius. The molten slag ejects out of the tube and blasts through the armor like a water jet. Since temperatures are so intense, it burns through everything behind the armor and around it.
This is made especially for Cheese to pierce enemy armor. This made from the Prototype Facility and is still determine whether it can be used. Click the sprite.