Hi Jeremy, if a creature has damage immunities except to adamantine weapons can it also be affected by magic weapons?Which creature are you referring to?
— Jeremy Crawford (@JeremyECrawford) May 30, 2017
We were looking specifically at iron golems but is there ever a time when adamantine trumps magic weapons?
— Randy Nickel (@Snick3) May 30, 2017
There is no general rule about adamantine weapons. A stat block says how they work on that creature, if at all.
— Jeremy Crawford (@JeremyECrawford) May 30, 2017
I take that to mean that against an iron golem magic weapons are resisted but adamantine bypass the resistance
— Randy Nickel (@Snick3) May 30, 2017
An iron golem is not immune to the bludgeoning, piercing, or slashing damage of a magic weapon. #DnD https://t.co/zeS0ahm55t
— Jeremy Crawford (@JeremyECrawford) May 30, 2017
An iron golem's immunity to bludgeoning, piercing, and slashing damage is bypassed by magical attacks and by adamantine weapons. #DnD https://t.co/Dw5Hegt1dA
— Jeremy Crawford (@JeremyECrawford) May 30, 2017