Adamantite

Adamantite is a metal found in YGGDRASIL and the New World.

Description
Adamantite among Orichalcum were ultra rare metals in the New World. Though by YGGDRASIL standards they were a grade below the Prismatic Ores. In addition Adamantite was the highest rank an adventurer could reach.

Appearance
In the Anime, adamantite is portrayed as a polished black metal.

Abilities
Adamantite was a rare magical material which was the hardest metal known to man, at least in the New World. The metal was highly expensive, even making a small piece like an adamantite plate was astronomical.

Trivia

 * So far only six examples of Full Platemail cast out of Adamantite exist in the Overlord series: Guardian Armor, armor worn by the Four Imperial Knights, and Zaryusu Shasha's armor.