Adamantium

Adamantium is perhaps the strongest material used by the Imperium, impenetrable to most commonplace weapons.^[1]

It is the material composing the Imperial Palace's Eternity Gate^[1], and is often used in conjunction with plasteel and ceramite, such as in the structure of Terminator Armour.

Sources

• 1: Warhammer 40,000 3rd Edition Rulebook, ^{[Needs Citation]}