Impervium

Impervium was a tremendously resilient alloy frequently used for the armor on capital ships. It was stronger than duranium, another type of protective metal.Star Wars: Galactic Defense
During the Clone Wars, General Grievous, Supreme Commander of the Droid Armies of the Confederacy of Independent Systems, flew a customized Belbullab-22 heavy starfighter named the Soulless One, which had a hull made of impervium.Star Wars: The Complete Visual Dictionary, New Edition
==Behind the scenes==
Impervium was first mentioned in the Star Wars Legends article Soldiers of the Empire! in 1978. Its first known canonical appearance was in the mobile-game Star Wars: Galactic Defense after a 2015 update.
==Appearances==
*Star Wars: Galactic Defense 
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*Star Wars: Starfighter Missions
==Sources==
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*Star Wars: The Complete Visual Dictionary, New Edition
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*Star Wars Complete Vehicles, New Edition
==Notes and references==
Category:Alloys