Off the top of my head id say there are a few “metal” things in DF, like if you put that shadow flame portal thing on a dragon force cover it wouldn’t be out of place, or the first boss of the current raid with its metal plating/raw flesh and bones under it.
And SL was way over board on metal with like every single thing in the maw looking like a night wish cover.
- - - Updated - - -
TBC also had the bronze, friendly blacks with Sebb and Kel repping the blue’s with him getting his own manga about how he was in love with the sun well.