Chthonic Bloodline

Your innate magic comes from a primordial source that glimmers within your soul. Much like those with similar "blessed" souls, this is a sign of a powerful familial connection to a divine being. However, your ancestry is of a more primordial and chaotic nature than most, begging to be set free. 

Your divine soul, with natural magnetism, is seen as a threat by some religious hierarchies. As an outsider who commands this type of power, these sorcerers can undermine the existing order by claiming a direct tie to the divine.

Chthonic Magic

Your magic surges from a primordial source, untamed and violent. Starting when you choose this origin at 1st level, your spellcasting can unleash surges of untamed magic. Once per turn, the DM can have you roll a d20 immediately after you cast a sorcerer spell of 1st level or higher. If you roll a 1, roll on the Chthonic Surge table to create a magical effect. If that effect is a spell, it is too wild to be affected by your Metamagic, and if it normally requires concentration, it doesn't require concentration in this case; the spell lasts for its full duration.

In addition, you learn the toll the dead cantrip, which does not count against your number of spells known. 

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Rolling on the Chthonic Surge Table:

Roll a d20 and a d100 to determine the effect. 

Magic Surge
d100	Effect	d100	Effect
01-05	For the next minute, any flammable object you touch that isn't being worn or carried by another creature bursts into flame.	51-55	You teleport up to 60 feet to an unoccupied space of your choice that you can see.
06-10	You cast Chill Touch.	56-60	You cast Mage Armor centered on yourself.
11-15	You cast Mirror Image.	61-65	A part of your features change as if affected by Shapechange.
16-20	A spectral shield hovers near you for the next minute, granting you a +2 bonus to AC and immunity to Magic Missile.	66-70	For the next minute, you can teleport up to 20 feet as a bonus action on each of your turns.
21-25	You cast Burning Hands.	71-75	You cast Sleep centered on yourself.
26-30	For the next minute, you regain 5 hit points at the start of each of your turns.	76-80	You cast Gust of Wind as a 3rd level spell.
31-35	You regain 2d10 hit points.	81-85	You cast Fireball as a 3rd-level spell centered on yourself.
36-40	You are transported to the Astral Plane until the end of your next turn, after which time you return to the space you previously occupied or the nearest unoccupied space if that space is occupied.	86-90	If you die within the next minute, you immediately come back to life as if by the Reincarnate spell.
41-45	Any flame within a 5ft radius of you is snuffed out.	91-95	You cast Fog Cloud centered on yourself.
46-50	You cast Blindness/Deafness centered on yourself.	96-100	You cast Gust of Wind as a 4th-level spell.

Favor of the Undying

Starting at 1st level, the power of the divine guards your life. If you fail a death saving roll, you can roll 2d4 and add it to 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.

Empowered Healing

Starting at 6th level, the divine energy coursing through you can empower healing spells. Whenever you or an ally within 5 feet of you rolls dice to determine the number of hit points a spell restores, you can spend 1 sorcery point to reroll any number of those dice once, provided you aren’t incapacitated. You can use this feature only once per turn.

Controlled Chaos

At 14th level, you gain a modicum of control over your magic. Whenever you roll on the Surge table, you can roll twice and use either number.

Unearthly Recovery

At 18th level, you gain the ability to overcome grievous injuries. As a bonus action when you have fewer than half of your hit points remaining, you can regain a number of hit points equal to half your hit point maximum.

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