(from the game Master of Orion II) The technology scavenged from the Guardian of Orion. Xentronium armor is roughly 5 times stronger than Adamantium, with only 1/4 the weight of Zortium. Xentronium is now used extensively for everything involving Mrrshan Starship Construction. This material is also found in Antaran ships of all classes. What Antaran ships lack in shield strength is made up for in armor strength.
Xentronium armor is not available for discovery via research in any of the categories. Instead, the technology is scavenged from the defeated Guardian that orbits the planet Orion, or via the cheat code EINSTEIN, which unlocks all technologies.