Fiendish Bloodline

In your lineage, at some point there lived a sorcerer whose pact belonged to a being of the 9 circles or the abyss itself, or one of your relatives had the audacity to make a pact with one of these entities for their own merit, be it wealth. Or achieve a greater merit, and know that aberrant you were born with a communication with hell, Or perhaps you were lucky enough to be born through one of the favors of an archduke or a demon prince, or perhaps simply, your soul came to a mortal body by simple chance, not being aware of what happened in another life, or you are simply one of the thousands of children who were born in some profane ritual, and you were "blessed", for having been born in these conditions, you obtain the following benefits.

Fiend Ancestor

At 1st level. Your ancestor is a fiend, but also You choose where your ancestor comes from, if is a devil, demon, regolith or maybe a succubus or incubus. The additional spell list associated with each fiend is used for the features you gain later, these spells do not count as your learned sorcerer spells.

Fiend Ancestry

Lv	Fiend	Devil	Demon	yugoloths	Succubus/incubus
1st	Detect Magic	Control Flames, Hellish Rebuke	Chill Touch, Inflict wounds	Blade Ward, Hunter's Mark	Message, Dissonant Whispers
3rd	Scorching Ray	Dust Devil	Blindness/Deafness	Shadow Blade	Tasha's Mind Whip.
5th	Erupting Earth	Fear	Summon Lesser Demons	Haste	Vampiric Touch
7th	Evard's Black Tentacles	Wall of Fire	Summon Greater Demon	Shadow of Moil	Confusion
9th	Geas	Infernal Calling	Negative Energy Flood	Far Step	Modify Memory

You gain resistance to poison damage and, depending on your ancestor, you learn a language and gain a special ability.

Devil. You Know infernal, gain 60 feet of darkvision and magical dark vision, and you double your proficiency bonus for CHA checks involving Devils.

Demon. You Know Abyssal, your maximum hit points increase in 1, and you double your proficiency bonus for CHA checks involving Demons.

Yugoloths. You Know Abyssal or Infernal, you can use your action to teleport up to 30 feet, and you double your proficiency bonus for CHA checks involving Yugoloths.

Succubus/incubus. You Know Abyssal or Infernal, your Natural AC it 10+ DEX mod + CHA mod, and you gain expertice in persuacion, performance or decepcion

Unholy sorcering

Starting at 6th level, You gain one resistance depending on your ancestor, also when you cast a spell that requires a saving throw, you can spend 1 sorcery point to make that target to roll with disadvantage.

Devil. You gain resistance to Cold damage and when you cast a spell from Evocation school you can spend 1 sorcery point to make that target to roll with disadvantage.

Demon. You gain resistance to Necrotic damage and when you cast a spell from Necromancy school you can spend 1 sorcery point to make that target to roll with disadvantage.

yugoloth. You gain resistance to Acid damage and when you cast a spell from abjuration school you can spend 1 sorcery point to make that target to roll with disadvantage.

Succubus/incubus. You gain resistance to psychic damage and when you cast a spell from Enchantment school you can spend 1 sorcery point to make that target to roll with disadvantage.

Fiendish Wings

At 14th level, you gain the ability to sprout a pair of Fiend wings from your back, gaining a flying speed equal to your current speed. You can create these wings as a bonus action on your turn. They last until you dismiss them as a bonus action on your turn.

You can’t manifest your wings while wearing armor unless the armor is made to accommodate them, and clothing not made to accommodate your wings might be destroyed when you manifest them, when you reach 18th level the speed become the double.

Fiendish soul

When you reach level 14, you learn the spell, summon fiend, if you use this feature to use the spell, the damage cannot break your concentration, you can use this feature once per long rest or spend 4 metamagic points to use it again, it depends on your ancestor, the type of fiend you summon.

Devil. The summon Fiend is the Devil version.

Demon. The summon Fiend is the Demon version.

Yugoloth. The summon Fiend is the Yugoloth version.

Succubus/Incubus. The summon Fiend can be any version.

True Unholy Sorcering

At level 18, if you use a spell that targets only one creature, you can spend 5 sorcery points to activate an additional effect; you can only use this ability once per turn.

Devil. When you cast a spell that deal fire damage, you can spend 5 sorcery points to use Immolation on the target, the target can repeat the saving thrown at the end of his turn

Demon. When you cast a spell that deal Necrotic damage, you can spend 5 sorcery points to use Negative Energy Flood on the target, the target can repeat the saving thrown at the end of his turn.

Yugoloth. When you cast a spell that deal damage, you can spend 5 sorcery points to use Scatter on the target, the target can repeat the saving thrown at the end of his turn.

Succubus/Incubus. When you cast a spell that deal Psychic damage, you can spend 5 sorcery points to use Hold Monster on the target, the target can repeat the saving thrown at the end of his turn.