GrimLock

The first Fighter to ever discover this path of broken guidance was soon consumed by his guilt and lust for souls that the power of the GrimLock had forced upon him. Grimlocks must sacrifice empathy and love for all living and dead things in order to keep sanity and soul, a tedious and dark deed indeed but what else could be better than ripping the very thing those selfish 'greater' deity's put inside every soul for...comfort.

Inherit Fusion

at 3rd level whenever you and only you kill an enemy creature with your weapon or hands, you can take half an hour to gain an amount of soul fragments equal to your charisma modifier to a maximum of your CHA modifier + your proficiency bonus, that then resets after a short or long rest to an amount of your Charisma modifier. These souls will then be used to help bring upon your grimlock features shown down below; 

Fragmentation Asset

You can pour 1D8 Necrotic damage into a weapons attack damage a number of times equal to your level per long rest by spending 1 soul for each time this feature is used.

Merciless Override

each turn you hold an attack with the same weapon and have one target in mind (do tell the DM of this target)  you gain an extra 1d6 necrotic damage die to that weapons eventual attack damage if it's against the target you had in mind but when hit the target must beat a CHA saving throw DC = 10 + CHA modifier + Proficiency bonus. If failed the damage is halved and when succeeded it is full ontop of the effected creature then becomes poisoned. 

Seemingless Mist

Whenever you hit a creature with a roll of 10 or higher you can use your bonus action and spend 2 souls turn into black, thick, cloudy mist and drift off into a spot of your choice within 10ft. This doesn't provoke any opportunity attacks. You can only maintain this form until the start of your next turn. 

Grinning shot

Starting at 7th level, whenever you shoot a projectile from a ranged weapon (120ft max), you can instead of making the projectile hit, you can imbued your body within the projectile and suddenly appear in a flash of black mist before the projectile hits it's Target and make a melee attack and maintain your position, 5 feet in front of your target. If this is attack is made and you are unseen by the target you gain an extra 4D6 Necrotic damage to the attack. This costs 2 soul fragments to use and can only be used a number of times equal to your charisma modifier per short/ long rest.

Reapers form

At 10th level you can take the form of a black cloth looking mist trail as an action by expending 5 soul fragments, in this form you can fit between spaces of only 1ft in both width and length. while in this form you are immune to piercing, slashing and bludgeoning damage that is non-magical, however you're vulnerable to radiant and Fire damage. While in this grim Misty form you have a movement speed of 60 ft, and you cannot take any action other than the movement action or a bonus action or reaction to go back into your original form. You may maintain the Reaper form for 1 minute before leaving it.

Salvation of the dead

Starting at 15th level, whenever you kill an Enemy creature and reap it's souls you gain a number of HP equal to the soul fragments you've gained × your Proficiency bonus. If your HP is Max, you gain this as temporary HP. This feature can only be used twice per short/long rest.

Broken Soul

Starting at 18th level, you have become completely oblivious to the meaning of love and fear. You become inmune to any charm and frighten affects/ spells and when being victimized to one of these you will have Advantage on your next attack against that who tried to mend what had been broken for so very long..