I’m a bit confused by the terminology FS used… They say ‘renegade runesmith’ (in the trailer) which combines the early name of the chaos dwarfs (chaos dwarf renegades, old stuff) and runesmith, which afaik is only used for uncorrupted dwarfs. So is Grungni a chaos dwarf who happens to be good with runes or is he an uncorrupt-born and later runesmith who went renegade (if thats even possible)?
All that i found is that chaos dwarfs use rune-hardened metal, and this stub:
Which i would assume from that he was a true runesmith before he went renegade.