The Merciless

Nightmare. Black mist surrounds your enemy, drawing forth their strength for your use.

As a bonus action, you can sap the strength from an enemy. The next time you hit a creature with an attack, you deal an additional amount of necrotic damage equal to 2 x your proficiency modifier and gain temporary hit points equal to the extra damage dealt.

You can use this ability once before refreshing it in town using Performing Sacred Rites or Religious Service Downtime actions.

At Higher Levels. Your proficiency modifier increases when you reach 5th level, 9th level, 13th level, and 17th level.