It is unknown whether the Chosen One helped establish good relations between Modoc and the Slags, the people of Modoc continued to consider the place haunted or simply wiped out the Slags in what they considered revenge for Karl's supposed death, since nothing on the matter is mentioned by the narrator in the endgame cutscene.
Slag from steel mills in ferrous smelting, on the other hand, is designed to minimize iron loss and so mainly contains oxides of calcium, silicon, magnesium, and aluminium.While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal.In nature, iron, copper, lead, nickel and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals.During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed.Slag is the collection of compounds that are removed.If the player cannot manage to do so, Modoc's inhabitants will exterminate all the people in the Ghost Farm, including children.
The Ghost Farm and the Slags appear only in Fallout 2.
Slag is drawn off the furnace just before the molten steel is poured into ladles for ingotting.
Ferrous and non-ferrous smelting processes produce different slags.
This event came to be known to them as "the Sealing". Few can bear to be on the surface because they are not used to having a black sea of nothingness above them.
They also cannot stand the bright light of the sun, as living underground for so long has devolved their eyes to a form of intense permanent light sensitivity.
So the Seal was broken, and they once again looked to the surface for survival, creating a small farm some years prior to 2241, which to the people of Modoc looked as if the farm appeared out of nowhere.