The Whispered One

You gain the following as you level in this class:

Whispered Knowledge

The following spells become known to you as you gain levels in this subclass:

1st level bane, inflict wounds
3rd level Blindness/deafness, ray of enfeeblement
5th level animate dead, bestow curse
7th level death ward, blight
9th level contagion, raise dead

Undead Fortitude

1st level

Your patron’s powers have a profound effect on your body and magic. You don’t need to eat, drink, or breathe.
You are resistant to Poison and necrotic damage. Furthermore you are immune to disease and have advantage on saving throws against the poisoned condition.

Commander of Death

1st level

The power of your patron allows you to command the dead to rise up and fight beside you. As a bonus action you can call forth the dead to fight beside you. Choose an undead of cr 1/4 or less (such as skeleton or zombie).
 On each of your turns as a free action, you can mentally command any creature you made with this feature. You decide what actions the creatures will take and where they will move.
You can use this feature a number of times equal to your proficiency bonus. You maintain control of the undead you create with this feature until they are destroyed. You may only maintain control over a number of undead created this way equal to your proficiency bonus. If you create more than you can control the oldest of them becomes a monster under the DM's control.

Dark Sacrifice

6th level

Your patron teaches you the secret of manipulating necromantic life force, allowing you to steal the energy that animates the undead to revitalize yourself. As a reaction to taking damage you can redirect it to any undead you can see whose CR is equal to or less than your warlock level. If the damage would reduce them to 0 hp you would take any remaining damage. You can use feature a number of times equal to your Proficiency bonus and regain expended uses when you finish a long rest. However you may not use this feature more than once on the same creature until the next dawn.

Dread Infusion

6th level

The undead under your control gain a bonus to their attack rolls equal to your Charisma modifier. Additionally on a hit they deal an extra 1d6 necrotic damage.
This damage increases to 1d8 at 11th level and 1d10 at 17th level.

Deaths Gaze

10th Level
Your invoke the power of the whispered one:
As an action you may make a ranged spell attack on a creature within 30ft of you. On a hit it deals 3d8 necrotic dmg and stuns the target for one minute.
At the end of each of the creature's turns it may make a constitution saving throw against your Spells Save DC ending the effect on a success.
Once you use this feature you cannot use it again until you finish a short or long rest.

Whisper of Death

14th Level 
Starting at 14th level, the necrotic energy you channel allows you to resist death. When you have to make a death saving throw at the start of your turn, you can instead spring back to your feet (no action required) with a burst of necrotic energy. You regain hit points equal to half your hit point maximum, and then you stand up if you so choose. Each creature of your choice that is within 30 feet of you takes necrotic damage equal to 2d8 + your Charisma modifier, and its' movement is reduced by half until the end of their next turn.
Once you use this feature, you can’t use it again until you finish a long rest.
Furthermore when you deal necrotic damage to a creature that is resistant to necrotic damage they take full damage instead.