Is this balanced?

I made this cultist like cleric subclass and I’m not quite sure if it’s balanced.

here it is.

Parasite Domain (cleric)
“It is not blasphemy, it is a greater calling.

Level 3: Deeds and lies
You will control there feeble minds.
You gain proficiency in persuasion, deception, and intimidation if you did not already. Also, up to your Wis modifier per long rest you may gain advantage on any Cha checks you make for the next 1 minute whenever you cast a cleric spell of level 1 or higher.

Level 3: Parasite domain spells
Power shall be yours.
Select one of the following Warlock patrons: Archfey, Celestial, Fiend, or Great Old One. The Patron Spells of your chosen Patron are Cleric spells for you. When you reach a Cleric level equal to a Warlock Level listed on the Patron Spells table for the Patron you have chosen, you thereafter always have the listed spells prepared.

Level 3: Blasphemous doubt
Your words will cut through the minds of all.
As a magic action you may present your holy symbol and expend a use of channel divinity to call upon unsightly truths and lies that target a creature of your choice. The creature you chose must make a Chr saving throw (Dc 8 plus your Wis modifier), on a failed save the creature take damage equal to the roll of a number of D6s equal to your cleric level, on a successful save the creature only takes half damage.

Level 6: Blood sacrifice
I will grant you aid.
Whenever a creature with a CR of 1/4th or more is killed by you or your allies you may grant one of the following benefits to yourself or one of your allies within 30ft of yourself as a reaction.

Profane vitality
The target of this feature gains temporary hit points equal to 4 times the CR rating of the creature that was killed.

Arcane transfer
If the creature killed had the ability to cast a levelled spell the target of this ability may regain an expended spell slot of a level of spell the creature killed could cast.

Ability can be used twice per short or long rest.

Level 17: Unholy ascension
I will show you your true self.
You gain the following benefits.

Tempered will 
You have advantage on Cha, Int, and Wis saves.

Skin of the heretic.
You gain immunity to one damage type of your choice.

I based the domain spells on the ua vestige patron warlock’s extra spell list thing.

Blasphemous Doubt does WAY too much damage. It should scale off of Proficiency Bonus. Arcane Transfer is also very strong. Other than that, it seems pretty decent. Not sure about the damage immunity, though. I've never seen that in an official feature, so I don't have a benchmark for balance. It should probably be a non-BPS damage type. A bunch of monsters do slashing damage, so that would be a pretty overpowered choice.