Feats

Boon of Bloodshed

Prerequisite
Level 19+
Ability Score Increase
+1 to any ability score (max 30)
Source
FRHoF

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.