Zynthium

"A dense armor made from a chemical mixture of Zynthium and other metals. Zynthium provides the best defense."

General
Zynthium is the final researchable ship armor, commonly used in medium- to high-level fleets.

Advantages
Zynthium is extremely mass-efficient and provides excellent protection. It is equipped on all sorts of ships up to Demon Corps Hulls. Levels I-IV are also used on lower-level hulls to replace Plasteel, Tritanium and Iridium, fully utilizing the available mass.

Disadvantages
While Zynthium provides a lot of health, it also carries a huge repair bill. Unless you are planning to build sniper decoys, do not max out your armor, or else your fleet will take forever to repair.

Trivia

 * Zynthium used to be a type of resource that had been removed.
 * It used to be called Zynthium Alloy along with the base version, but was simplified to Zynthium.
 * Zynthium is a play on the word "Synth" (for synthetic), with the "-ium" suffix used for elements including most metals.