The Fortune favors that you when someone is tried to strike you. You can also gain the below mentioned advantages.
- You can increase your dexterity, Constitution, or Charisma score by 1, up to a maximum of 20.
- Whenever the creature that you are able to see can hit you by an attack roll and even you can use your reaction to the force which creature to reroll. However once you would use this capability, even though you can not use it again unless until you would roll the initiative at the start of combat or else until you would finish the short or long rest.
You can also read about savage attacker 5e feat.