Boon of the Soul Drinker
Epic Boon Feat (Prerequisite: Level 19+, Spellcasting of Pact Magic Feature)
You gain the following benefits.
Ability Score Increase. Increase one ability score of your choice by 1, to a maximum of 30.
Grave Resistance. You have Resistance to Cold damage and Necrotic damage.
Siphon Life. When an enemy within 120 feet of you is reduced to 0 Hit Points, you can take a Reaction to regain 50 Hit Points. Once you use this benefit, you can't use it again until you finish a Short or Long Rest.