D&D Next: Infernal Pact Homebrew

Seeing as the official warlock class was released a few days ago, I figured it would be more constructive to create an infernal pact to go along with it, rather than keep up with my homebrew version. Seeing as Levistus really liked the rapier, my alternative feature for level 3 would be to burn a favor in order to get bonuses with it.

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Infernal Pact: Levistus

You have forged a pact with Levistus, the archduke of Stygia. Cunning and ruthlessly ambitious, Levistus grants you a measure of his power in exchange for the use of your senses and knowledge as he seeks a way to escape his icy prison.

      Level 1: When you gain this boon, your eyes turn black, as Levistus uses your eyes to view the outside world.

      Benefit: When you make an Intelligence, Wisdom, or Charisma check or saving throw, you can spend a favor in order to have advantage.

      Level 3: All of your teeth become a bit sharper.

      Benefit: As a reaction, you can impose disadvantage on a melee attack made against you by a living creature.

      Level 5: Your skin becomes paler, as if you were constantly freezing cold.

      Benefit: As an action, you can spend a favor to gain cold resistance for 1 minute.

Warlock Invocations

Blade of Annihilation

Minor invocation

You conjure a sword of black metal, forged in the Nine Hells.

      Effect: As an action, you conjure a longsword. You gain a +1 bonus to attack rolls when attacking with it, and it uses your Charisma instead of Strength for determining the damage bonus. You can then cast a spell or make an attack.

Hellrime Blast

Lesser invocation

You draw upon the freezing cold of Levistus’s prison, unleashing a torrent of black ice at your foe.

      As a consequence of knowing this invocation, your touch is unnaturally cold.

      Effect: Make amagical attack against a creature within 50 feet of you. If you hit, the target takes 3d8 cold damage, and must make a Fortitude save or have disadvantage on Dexterity checks and saves for 1 minute.

      When you reach level 3, the damage increases to 4d8.