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Black Gem (黒い宝石) is a type of fungal growth native to the New World.


On his visits to Arwintar, Pe Riyuro would bring this item for Jircniv Rune Farlord El-Nix.[1]


These mushrooms are known to be fragrant and plump.


While the overall benefits of Black Gem are unknown, though it is regarded as a luxury item.


  • Judging by their description, its possible they are similar to truffles which are also known as black diamonds.


  1. Overlord Volume 13 Intermission