Iskar Vale 5e
This metal is found deep under the Roespine Mountains, its ore is rare and dangerous to obtain, and only a few, secretive tiefling miners have developed a way to wrench its stubborn fruit from the stone womb.
This black-tinted metal is so rare that less than a hundred weapons have been forged and no more than five suits of armor. Typically reserved for kings and wealthy merchant guards, Ebonsteel is nearly unknown to all except those who have direct ties to it.
Items crafted of this material seem to absorb the sunlight and glisten in the glow of the full moon. They are often used to store powerful enchantments, though more than a few have been known to be corrupted by dark powers.