Gluttony

Filling your belly has become more than a compulsion. With every step your hunger becomes more ravenous. Each passing moment with out a delectable morsel to covet on your tongue has become an agony; but you have found a new source of strength in the flesh of your foes. Their meat grants you might and vigor, their scream fill your ears with pleasure. All will be consumed in your ever gaping maw.

When you take this feat you alignment is changed to Evil. You consider anyone whose goals do not align with your own as nothing more than a beast to be preyed upon.

When a creature is reduced to 0 Hit Points as a bonus action you may feast upon it's flesh. If you do so gain 26 (4d12) Hit Points. Any excess Hit Points are converted into Temporary Hit Points.

You may use this feat a number of times equal to your Proficiency Bonus per Long Rest

(Credit to my DM Trogdor for the feat.)
((Will update with changes if any occur.))