College of Lore bards get the Cutting Words feature at 3rd level:
When a creature that you can see within 60 feet of you makes an attack roll, an ability check, or a damage roll, you can use your reaction to expend one of your uses of Bardic Inspiration, rolling a Bardic Inspiration die and subtracting the number rolled from the creature’s roll. You can choose to use this feature after the creature makes its roll, but before the DM determines whether the attack roll or ability check succeeds or fails, or before the creature deals its damage.
When a bard uses Cutting Words to reduce damage, is resistance/vulnerability applied before or after the damage is reduced?
Best Answer
Resistance/Vulnerability is applied at the very end of damage calculation, after the Cutting Words
The basic rules say (emphasis mine):
Since Cutting Words is a flat (although variable) damage reduction, it occurs before resistance or vulnerability is applied.