New 5E Sorcerous Origin - The Tainted Soul

While I like most of the class options in the 5E PHB, I felt like the available flavors of Sorcerer were a bit unappealing, especially from an old-schooler's perspective. With that in mind, I came up with the Tainted Soul, a Sorcerer option designed to evoke the type of Sorcerer one might come across in a Conan story, or perhaps a Frazetta painting.

Tainted Soul
Something unnatural happened to you - maybe your mother was exposed to foul sorcery while you were still in the womb, maybe as a youth you snuck a peek at a forbidden tome and were forever changed, or maybe you were cursed for some great sin you committed. In any event, your soul is now tainted with the stain of dark magic; whether you use this power for good or evil is up to you.

Twisted Visage
You are physically marked by your magic - perhaps with something ugly, like a cloven hoof or night-black horns, perhaps something beguiling like softly glowing eyes or unearthly beauty. While this sets you apart from most mortals, it does have its advantages - apply double your Proficiency bonus to your choice of Intimidation or Persuasion.

Ritual Caster
Unlike most Sorcerers, you are not shy of dusty tomes or ritual magic. You have the ability to use Ritual magic from the Sorcerer or Wizard spell lists, and start with a ritual book containing two such spells.

Hypnotic Presence
Starting at 6th level, you can exert your superior presence to bend the will of lesser mortals. Once per short rest, one creature within 60 feet of you that can see you must succeed on a Charisma saving throw or suffer the effects of the charm person spell. At 10th level and above, your control is even greater, and your target must save or suffer the effects of a dominate person spell.

Unnatural Vigor
Starting at 14th level, your body has become so thoroughly tainted by sorcery that it is nearly impossible to kill you. Once per long rest, when you are reduced to 0 hit points, you may use your reaction to immediately regain half of your maximum hit points, rounded up.

Demonic Servant
Starting a 18th level, you may call up a being from the netherworld to act as your servant, protector, and familiar. This servant takes the form of a demon, devil, fey, or undead of your choice of not greater than CR9. If this servant is destroyed, you must wait one week before summoning another.