Pact of Death

I'll make this later.

Intense Hunger

Starting at level 1. Designate one creature within sight, and that creature must succeed in a Wisdom saving throw equal to (8 + your spellcasting modifier + Proficiency bonus) or be feared to you, until it loses sight of you for 1 hour, or until you attack another creature, or if you designate another creature, or until it dies. after this creature dies, provided that it is in range, and the spell is still in effect, the creature's corpse will heal you if you eat it. You can only heal from this corpse 3 times, and you heal for its constitution modifier times your charisma modifier. You can heal for a minimum of one. 

You can target a different target as many times as equal to your charisma modifier.

Eating this corpse also has a chance for you to eat the soul, and regain a spell slot. for the first time you consume a whole corpse after a long or short rest, roll a d100, and on a 100, you regain one expended spell slot, if you have not lost a spell slot, you instead gain temporary hitpoints equal to your warlock level. 

Additionally, you do not get sick from eating spoiled meat, or raw meat, and you don't mind the smell of said foods. Eating vegetables is unappealing to you. (Kind of like IRL)

The Souls Curse

at 6th level, You gain the 'Undying Servitude' invocation.

With this invocation, you can cast animate dead at will with no Verbal, Symbolic, or Material components, but the amount of undead you can animate cannot surpass an amount equal to (Charisma Mod + Proficiency Bonus) these undead also gain maximum HP equal to your Proficiency Bonus, and additional damage equal to half you charisma modifier, rounded up.

Death's Life

Any undead you create using a spell, such as Spirit Shroud, Animate Dead, or Finger of Death, has increased HP equal to half your level + Charisma. 

At level 17, the Wight you create has this effect as well, but not the Wight's undead.

Soldier of Death

Touch one corpse, you gain one Wight under your control. This Wight has a minimum amount of the HP of a normal Wight, additionally, this Wight can only take control of 4 undead.
 
If this Wight dies, you must spend 3 hours creating a new one. these hours can be in increments of no smaller than 3 increments, the zombies stay under your control, and when the new Wight is created, it can't create any more undead, until all of the previous Wight's zombies have perished.