Feats

Interception

Prerequisite
Fighting Style feature
Ability Score Increase
None
Source
XPHB

When a creature you can see hits another creature within 5 feet of you with an attack roll, you can take a Reaction to reduce the damage dealt to the target by 1d10 plus your Proficiency Bonus. You must be holding a Shield or a Simple or Martial weapon to use this Reaction.