@JeremyECrawford if a diviner wizard uses Portent to replace an attack roll with advantage, is another die rolled and the higher taken?

— Trey Brumley (@tipbruley) February 5, 2016

A wizard's Portent is meant to replace the roll—after advantage/disadvantage is applied. #DnD https://t.co/WBiIGPfcB1

— Jeremy Crawford (@JeremyECrawford) February 17, 2016

@JeremyECrawford thanks! Still a bit confused. Does it replace just one of the die you would roll with advantage or do you not roll at all?

— Trey Brumley (@tipbruley) February 18, 2016

The wizard: "I use Portent!" The d20 (or d20s with adv./dis.) is rolled. Portent replaces the resulting die. #DnD https://t.co/yMxuTdHGit

— Jeremy Crawford (@JeremyECrawford) February 18, 2016