The Soulless Warlocks

Soulless Warlocks are the result of a creatures soul being sold by another person, most of the times, it happens when a parent sell the soul of their children for power, that child does not have control of their soul. The lack of a soul causes a being to start naturally developing magic powers akin to a warlock's, as whatever took their soul left traces of dark magic in it's place during the process. If a soulless manages to get their soul back they don't lose their power until purifying themselves of the traces of dark magic left inside.

Expanded Spell List

Being a Soulless Warlock gives you these spells:

Spell Level	Spells
1st	Disguise-Self, False Life
2nd	Calm Emotions, Gentle Repose
3rd	Fireball, Bestow Curse
4th	Black Tentacles, Phantasmal Killer
5th	Modify Memory, Reincarnate

You also gain proficiency with the intimidation skill and immunity to the [effect]frightened[/spell] effect

Seeping Soul

At 1st level you gain the ability to use an action to attack with the dark magic inside of you, dealing 3d4+2 of necrotic damage to a creature within 5 feet of you.

The damage increases by 1d4 at 5th level (4d4), at 9th level (5d4), and at 16th level (6d4).

Darkened Being

At 6th level your lack of a soul grants you resistance to necrotic damage, immunity to disease and advantage on stealth rolls.

Revengeful Husk

At 10th level whenever a hostile creature succeds on hitting you, you can use your reaction to deal the same amount of damage it dealt to you back to it, this ability can be used 3 times per short rest and can only be used once between your turns.

Soul Devouring

At 14th level you gain the ability to, once per short rest, when you take an enemy to 0 hit points, you can devour their soul to heal yourself back to full health.

This ability does not use an action to be used but you can choose if you want to do it or not.