Delicious Pain

Delicious Pain
Feat
Prerequisite: Level 4

You gain the following benefits.
Toughened Flesh.
Immediately after you take Bludgeoning, Piercing, or Slashing damage, you can take a Reaction to gain Resistance to Bludgeoning, Piercing, and Slashing damage until the start of your next turn. Once you use this benefit, you can't use it again until you finish a Short or Long Rest.

Source: Astarion's Book of Hungers (ABH), page 9