Neutronium

The densest substance in the universe

Neutronium is a hyperdense alloy made using the pure-neutron material found in Neutron Stars and a careful mix of tritanium, Duranium, and Monotanium. Only a handful of races have developed the technology to manufacture Neutronium Alloy.

The USS Enterprise NCC-1701-G had 3-atom thick neutron plates as armor along its dorsal hull, making it one of the heaviest armored warships in the galaxy and able to absorb the force of a World-Killer Device, a massive weapon that simulated a warp core breach and could annihilate an entire planet.

It took nearly 6 years to manufacture enough Neutronium Alloy to create the Enterprise's armor plates. They have since been removed from the ship and are undergoing repairs, at this point no other Neutronium-plated ships are functional as the raw density of the material requires a powerful Structural Integrity Field to maintain.