@Holygan black metal is usually due to incorrect setup of your metalic texture and/or missing reflection probes. Do you pack metalic information into channels or use a simple value?
Btw if you all use real-world values for the directional light, such as say 125 000 lux, you won’t be able to visualise Distance Fields because EVERYTHING becomes insanely overexposed despite manually tweaking the post process camera settings.