@JeremyECrawford A mummy w/ a Ring of Fire Resistance: how does it interact w/ mummy's fire vulnerability?
— Trevor Holland (@imnotasnowflake) March 26, 2016
You apply resistance and then vulnerability after all other modifiers to damage (see PH, 197). #DnD https://t.co/DL1hvU4vO6
— Jeremy Crawford (@JeremyECrawford) April 1, 2016