So originally, when I was reading mistborn, the first cosmere book I read, I knew that there was a larger universe with shards and stuff (I watched a video about adonalsium and the shattering and all that stuff), I assumed that metals were unique in their properties to scadrial, and then I started reading Stormlight and realized that metals were crucial to fabrials, also metals such as iron, steel have properties in Tress. Do we have a specific reason that metals have such an effect throughout the cosmere? Metals aren’t inherently invested or anything so why are they so important?