Gromril (a.k.a. Meteoric Iron) is from the warp. As the gods of Law originated from certain eddies in the warp (Law being one of the many possibilities of Chaos), so did gromril. Gromril also falls to the Warhammer World through the Old Slann warpgates. Dwarfs have discovered it in several places where meteors have struck the World. In fact, gromril is only found in the presence of warpstone.
The reverse, however, is not true. Raw gromril is a silvery metal that is incredibly rare and valuable and only dwarves know how to work it. Gromril actually has more than one state. There are three methods of refining it and each method has different effects on the metal.
The first method is widely known among the dwarves and turns raw gromril into the refined gromril that is used for coins, armor, shields, and weapons. This refined gromril is sometimes called Mithril by Old Worlders. The second method is not widely known among the dwarves and its secret is jealously guarded by the dwarven Master Smiths that do know it. This second method turns raw gromril into Adamant. The third method turns raw gromril into a crystalline metal known in legend as Laihtero.
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