Quantum-crystalline armor

Quantum-crystalline armor is unique armor equipped to the Sun Crusher. It made the Sun Crusher nearly indestructible. Examples of how strong it is include that the Sun Crusher once rammed right through the bridge of an Imperial Class Star Destroyer without taking any damage, and it also managed to survive a glancing blow from the the Death Star prototype's super-laser. So pretty much the only things that can damage it are things that can destroy planets. It is however, very expensive to make, costing as much as the first Death Star.