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'''Adamantium''' (adjective, ''Adamantine'') is perhaps the strongest material used by the Imperium, impenetrable to most commonplace weapons. 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]]. The [[Space Marine]] [[Adamantine Mantle]], is said to be able to withstand any attack.²