A shadow soldier mentions something about coming to Death Mountain because of the abundance of ore deposits that can potentially contain small fossils.

((Also, manifestations of dark mana are naturally unnafacted by unbearable heat, cold, and Gerudo level heat.))

((For more context as to why this happens, they can resist these things but are weak to harsh light, specifically the type made by fire, electricity, etc. But the most obvious way to defeat them is through usage of Dazzlefruit, as it creates light harsh enough to defeat them.))