Death Knight Initiate

You gain the following benefits.
Ability Score Increase. Increase your Strength or
Charisma score by 1, to a maximum of 20.

Death Points. Your dedication to the path of the
Death Knight gives you access to profane powers of
undeath. Your ability to use such powers is
represented by Death Points. You have a number of
Death Points equal to your Proficiency Bonus. You
regain all expended Death Points when you finish a
Long Rest.
You can expend Death Points to use certain Path of
the Death Knight benefits. This feat gives you one
such benefit: Dread Strike.

Dread Strike. You always have the Wrathful Smite
spell prepared. Charisma is your spellcasting ability
for this spell. You can cast it without expending a
spell slot by expending 1 Death Point. When you
expend Death Points to cast Wrathful Smite, the
target has Disadvantage on Wisdom saving throws
to avoid or end the spell’s effect. You can also cast
the spell using any spell slots you have.

This is an import of Unearthed Arcana's Villainous Options used for testing before the official release.