So at level 1, they start with the highest AC possible in the game without even wearing armor, and it gets stronger as you level, they can use their CHA for attacks and damage, they get a magic weapon and a shield, and an anti-death effect, that all recovers at the end of a short rest.
At level 6 you get to mark a target that when you crit you automatically max damage, and when they die, you regain a spell slot with unlimited uses.
At 10 you copied the Hexblade lvl 10 ability, which is overpowered because of the lvl 6 ability, and at 14 you overpower the lvl 1 ability even more by making it basically unlimited use.
Your spells seemed to have a theme but mass healing word, and death ward seems to not fit with the theme, and Steel Wind Strike seems like it was put in to make this warlock even more overpowered.
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At level 1 Hexblade gets
*Proficiency in Medium Armor, Martial Weapons, and Shields
*The ability to use Charisma in place of Strength of Dexterity on attack and damage rolls
*A curse feature that let's them add proficiency bonus to damage, crit on 19, and heal hit points equal to Warlock level + charisma modifier when killing a cursed target. Recharges on a short rest.
At level 1 Bestower gets
*An
action to use transformation that lasts a
number of hours equal to half its Warlock level
*
While transformed, it has an AC of 18(19 at level 9, 20 at level 17)
*
While transformed, it can use Charisma in place of Strength of Dexterity on attack and damage rolls
*Upon transforming, it can create weapons and shields.
Bestower isn't proficient in martial weapons or shields when not transformed.
*You can choose to drop to 1 hit point instead of 0,
but doing so causes your transformation to end prematurely
At level 6 Hexblade's can
*Kill a target, and revive them as a buffed specter who serves them. Specter vanishes after a long rest.
At level 6 Bestower gets
*A curse feature that let's them ignore cover, get maximum damage on crit, and recover a spell slot when killing a cursed target. Unlimited use, but can only have one active at a time.
Can only curse targets on reaction, with the trigger being the Warlock or its ally being targeted by an attack.
At level 10 a Hexblade gets
*As a reaction to cursed targets attacking you, roll a d6, and on a 4 or higher, the attack misses.
At level 10 a Bestower gets
*When a cursed target attacks you, roll a d6, and on a 4 or higher, the attack does no damage, but any non-damaging effects carry through.
At level 14 a Hexblade gets
*Unlimited use of Hexblade Curse
At level 14 a Bestower gets
*When rolling initiative, you regain a use of your transformation if you have none left
I'm not really sure how this archtype overpowers the hexblade when I put them side by side.
As for the spell list, I basically cut and paste the Hexblade spell list, but took out all the illusion spells. Again, this subclass is based on the magical girl genre, power rangers, etc. Mass Healing word is supposed to be like an inspiring speech made to give teammates hope in the face of defeat. Death Ward was a bit meta, but is supposed to be a play on plot armor. Steel Wind Strike is ... the most anime spell ever.