The Darkblade ( Hexblade reforged )

You have made a pact with a an entity who can control the stuff of shadow in the Shadowfell. giving you more control of dark hexs and material creation. With the mastery of weapons and inflecting pain.

such Entities can be powerful immortals involved in negative energy , Sentient stuff of shadow, dark emotions and sentient weapon.

Expanded Spell List

The Darkblade 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.

Fiend Expanded Spells

SPELL LEVEL	SPELLS
1st	shield, wrathful smite
2nd	blur, branding smite
3rd	elemental weapon, haste
4th	fire shield, staggering smite
5th	banishing smite, creation

Darkblade's Curse

Starting at 1st level, you gain the ability to place a baleful curse on someone. As a bonus action, choose one creature you can see within 60 feet of you. The target is cursed for 1 minute. The curse ends early if the target dies or you die. Until the curse ends, you gain the following benefits:

• The Cursed target doesn't benefit from half cover and three-quarters from you, you also always know the target's location and cant hide from you.
• If the cursed target drops to 0 hit points, you regain hit points equal to your warlock level + your Charisma modifier (minimum of 1 hit point).
• Whenever you take the Attack action against a cursed target, you can make one additional attack. You can make this additional attack a number of times equal to your Charisma modifier (a minimum of once). You regain all expended uses when you finish a long rest.

You can't use this feature again until you finish a short or long rest.

Additionally 

Dark Warrior

At 1st level, you acquire the training necessary to effectively arm yourself for battle. You gain proficiency with medium armor, shields, and martial weapons.

Additionally the influence of your patron let you use your magic to wield your weapons an strike your foes, you can use your Charisma modifier for attack roles and damage roles instead of Strength or Dexterity made by a single handed weapons, this benefit extends to Your pact weapon if you choose Pact of the Blade feature or any weapon or attack created by a warlock feature or spell no matter the weapon type.

Extra Attack

Starting at 6th level, you can attack twice, instead of once, whenever you take the Attack action on your turn.

Pain of the Darkblade's curse

When you reach 6th level your darkblade's cure becomes more potent causing more harm to the target. you gain the additional features on your cursed target:
• You gain a bonus to damage rolls against the creature cursed by your Darkblade's Curse. The bonus equals your proficiency bonus.
• Any attack roll you make against the cursed target is a critical hit on a roll of 19 or 20 on the d20.

Darkblade's Armor

At 10th level, your hex grows to protect you from harm. If the target cursed by your Darkblade's Curse hit you with an attack or causes you to take damage, you can roll a d6. On a 4 or higher, you ignore the damage taken and any other effect.

You can use this feature a number of time equal to your 1 + Charisma modifier (a minimum of twice), you can't use it again until you take a long rest, unless you expend one Hit Die and take force damage equal to the number rolled on the d6. This damage can't be reduced or prevented in any way.

you cant use this feature if you are incapacitated. 

Master of Curses

Starting at 14th level, you can spread your Darkblade's Curse from a defeated creature to another creature. When the creature cursed by your Darkblade's Curse drop to 0 hit points, you can apply the curse to a different creature you can see within 30 feet of the defeated creature or you, provided you aren't incapacitated. When you apply the curse in this way, you don't regain hit points from the dropping previously cursed creature to 0 hit point.

if there isnt a creature within range at that time you can curse another creature within 60 feat of you as a bonus action in a subsequent turn provided a minute has not passed since the ending of the curse.