Boon of Bloodshed

Boon of Bloodshed
Feat
Prerequisite: Level 19

You gain the following benefits.
Killer's Fortune.
When an enemy you can see is reduced to 0 Hit Points, you gain Advantage on the next attack roll you make before the end of your next turn.
Power from Pain.
Once per turn, when you make an attack roll while Bloodied, you can deal extra damage to the target equal to your Proficiency Bonus. The extra damage's type is the same as the attack's type.

Source: Forgotten Realms: Heroes of Faerûn (FRHoF), page 42