The Souleater

Your patron is an entity which feeds on (humanoid) souls. It offers a symbiotic pact in which you're allowed to use its strenght in exchange to feed it with souls.

Expanded Spell List

The Souleater lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Archfey Expanded Spells

Spell Level	Spells
1st	[Tooltip Not Found], [Tooltip Not Found]
2nd	[Tooltip Not Found], [Tooltip Not Found]
3rd	[Tooltip Not Found], [Tooltip Not Found]
4th	[Tooltip Not Found], [Tooltip Not Found]
5th	[Tooltip Not Found], [Tooltip Not Found]

Patron Hunger

Starting at 1st level your patron starts demanding you to feed it.

Your Patron Hunger points equals your Proficiency bonus.
Each time you cast a spell using a Warlock Spell Slot, make a CHA DC (15 - CHA modifier). On a failed save you spend one of the Patron Hunger points.
To regain Patron Hunger points you have to reduce a creature's HP to 0 using a Warlock spell or cantrip.
A creature that has died this way, can only be resurrected using a Wish spell.
Each time a creature dies this way, you regain 1 Patron Hunger point.

As a Bonus Action, you can regain 1 Warlock Spell slot using 1 Patron Hunger point.

Whenever you cast a Warlock Spell using a Spell Slot, if you fail the CHA DC and you don't have any Patron Hunger points remaining, your patron will feed on you dealing 1d6 damage. This damage can't be avoided by any means.
This damage increases by 1d6 every 3 Warlock levels being 2d6 at level 4, 3d6 at level 7, 4d6 at level 10, 5d6 at level 13, 6d6 at level 16, 7d6 at level 19 and 8d6 at level 20.
If your HP drops to 0 this way, your patron consumes your soul and you die. You can only be resurrected using a Wish spell.

Soul Seeker

Starting at level 6, as a Bonus Action you can sense your surroundings' life forms.

In a 60ft diameter centered on you, you get to know which is the entity with fewer HP (remaining or total).
You can narrow down the search by indicating its nature, race, size or hostility towards you. The level of narrowing it down should be considered and agreed with the DM
If multiple entities have the same amount of HP you sense all of them.

Soul Harvest

Starting at level 10, when dealing damage to a creature using a Warlock Cantrip or Spell, if the remaining HP of the creature is lower than your Warlock Level, the creature's HP automatically drops to 0 HP and you regain one Patron Hunger Point.

When a creature's HP drop to 0 HP this way, it can only be resurrected using a Wish spell.

Soul Pact

Starting at level 14, when you fail the 3rd Death Save, you can spend 5 Patron Hunger Points to regain consciousness with 1 HP.