Infernal Blood

While some claim lineage from powerful dragons or aspects of uncontrolled magic itself, your powers manifest from an ancient pact, an infernal bloodline, or some other form of untold connection to the Nine Hells.

 

You may not have ever actually seen or met a devil, however; many find themselves manifesting their powers from their blood. You may struggle with the feeling or constant urge to burn those who stand in your way in unending hellfire, and if you're not careful, you may succumb to an innate lust for power or a desire to corrupt the souls of the innocent.

 

 

Credit for this sub-class goes to Reddit user nulspace.

Unholy Heritage

You trace your heritage to a Devil of the Nine Hells. Your lineage imparts unique features and benefits.

At 1st level, you can speak, read, and write Infernal. If you already know Infernal, you can learn a language of your choice.

When making a Charisma check with regards to interaction with a Devil, your proficiency bonus is doubled, if it would apply.

Infernal Magic

Your fiendish blood allows you to learn spells normally associated with the warlock class. When your Spellcasting feature lets you learn a sorcerer spell of 1st level or higher, you may choose the new spells from the table below, in addition to the sorcerer spell list. You must otherwise obey all the restrictions for selecting the spell, and it becomes a sorcerer spell for you.

 

Spell Level	Spell
1st	Bane, Hellish Rebuke, Protection from Evil and Good
2nd	Calm Emotions
3rd	Feign Death, Remove Curse
4th	Fire Shield, Hallucinatory Terrain
5th	Dream, Flame Strike
6th	-
7th	-
8th	Demiplane
9th	-

Ungodly Curse

Starting at 1st level, you exude an ungodly aura that curses your enemies.

When an enemy succeeds on a saving throw made as a result of your action, you can roll 1d4 and subtract it from the total, possibly changing the outcome.

Once you use this feature, you can’t use it again until you finish a short or long rest.

Tainted Spell

Beginning at 6th level, you may spend 2 sorcery points to draw on the energy of the Nine Hells to taint one of your spells with unholy magic. This ability counts as a Metamagic option.

Empower one of your damage-dealing spells with searing hellfire. Change the spell's damage type to fire. Every target with Resistance to fire damage has their Resistance ignored. If a target is neither Immune nor Resistant to fire damage, it takes additional damage equal to your Charisma modifier.

Unholy Metamorphosis

At 14th level, your Infernal heritage begins to manifest physically, blurring the line between where your essence ends and where the devil begins.

Horns begin to grow slowly from your head, and your flesh becomes uncomfortably warm to the touch.

You become resistant to fire and poison damage.

You become proficient at deception checks; if you were already proficient, your proficiency bonus is doubled.

Vengeance of the Nine Hells

At 18th level, the denizens of the Nine Hells offer you their protection.

As a reaction, when an enemy reduces your hitpoints to fewer than half of your maximum hit points, you can inflict fire damage to that enemy equal to half your hit point maximum.

Once you use this feature, you can’t use it again until you finish a long rest.

Greater Tainted Spell

At 18th level, your Tainted Spell metamagic option is further improved.

You have attained mastery over the fires of the Nine Hells. Now, when you use your Tainted Spell feature, you may spend 2 additional sorcery points to cause every target of the spell with Immunity to fire damage to be treated as only having Resistance against it. You do not ignore this Resistance.