Tungsten

Tungsten (often called "Wolfram" in germanic languages, which is why its atomic symbol is "W") is a semi-common metal element that can be found deep underground. It is glossy black in color. Despite not being able to be used for tools due to it being so heavy and brittle, its immense durability, hardness, temperature, and corrosion resistance make it very useful in a multitude of other applications, including alloys and casings for high-end machine components.

It can be used in the Custom Nuke. It contributes 1 to its salted stage, the only material that contributes to the salted stage and isn't a multiplier.

It is also used to make the tungsten reacher