Imp gave +4 NOT RoW, later transmuted to RoW. Thanks to new blacksmith reward, reforging the RoWs twice can net me single +21 RoW which made farming +12 equipment possible without Rogue's ring talent.
Thank you! With latest blacksmith reward, +10 RoW farming would be always possible in 0 challenge run if you can pour every SoU and blacksmith’s double forge on a +0 RoW.