Shadow Reaper

The Grim Reaper is the lord of death—a black, shrouded specter who appears when your time on earth has come to an end. Although his personality and his work are as mysterious as death itself, one thing is for certain: he’s not someone you want to meet any time soon.

Shadow scythe

Conceal your weapons in shadows and turn it into a scythe in which you can then use the scythe for Necrotic damage 

Infused Death

At 6th level, you can feel the power of death run in your veins, giving your body resistance to Necrotic and Poison damage.

Shadow Armor

As necromantic magic flows through your body, it causes physical traits of your divine heritage to emerge. At 1st level, your hit point maximum increases by 1 and increases by 1 again whenever you gain a level in this class.

Shadow Style Boxing

You fight with a shadow of yourself in total synchronization which in turn doubles your attack

Soul Snatcher

if you use this ability as a final hit on an enemy Use a scythe of shadow energy to take the sol of your enemy. it is then contained in the endless darkness until you choose to use it

Reap the Souls

At 6th level, you benefit from the reaping of souls, siphoning their last semblance of life energy to bolster your own. When you reduce a hostile creature to 0 hit points with your "Scythe", you may regain hit points equal to your Charisma modifier + your warlock level (minimum of 1). You can use this feature a number of times equal to your proficiency bonus, regaining all uses on a short rest.

Shadow manipulation

 you gain Shadow Harvest: You channel your power over shadows to make your enemy attack themselves. All enemies within 50ft. of you get attacked by their shadows, the shadows deal damage equal to the creature's attack + 10 damage. If a creature affected by this ability dies from it, you can summon its shadow for 1d4 + your WIS modifier rounds. The shadow creature has the same stats as the original. You can use this ability 3 times per week, each time you use this ability you gain 1lvl of exhaustion. 

Soul Shatter

When you reach level 14 you are a master of manipulating ones soul. When you reach this level you can hit ones soul and instantly destroy their soul making them a husk that no longer has a soul. When you strike the creature with it they must make a CON saving throw against an DC 17 the increase with your level to a max of 20. If they fail their soul is destroyed and they die if they succeed they take 8d10 damage and their soul is permanently damage and they will never try to harm you again. to use this you have to use all available magic slots. this also cause 2 lvl's of exhaustion