The Void

As a Void sorcerer, you may decide on how these powers came about. Were they eniaite, did you loss something within you, were you cursed, did something get taken from you. Emotions run this class, chose one to have lost, and make it as if your emptiness is what drives the powers within you to take as much as you can to fulfill the void of what may or not be missing

Void Caster

Starting at 1st level you learn additional spells when you reach certain levels in this class, as shown on the Void Spell table. Each of these spells count as a sorcerer spell for you, but it doesn't count against the number of sorcerer spells you know.
Whenever you gain a new sorcerer level, you can replace one spell you gained from this feature with another spell of the same level. The new spell must be a necromantic or abjuration spell from the sorcerer, warlock, or wizard spell list.

Void Spell Table

Sorcerer Level	Spells
1st	Absorb elements, Armor of Agathys
3rd	Wither and Bloom, Ray of Enfeeblement
5th	Vampiric Touch, Protection from Energy
7th	Death Ward, Shadow of Moil
9th	Enervation, Negative Energy Flow

 

Additionally, you can chose to use Constitution as your spell casting ability instead of Charisma 

Void Soul

Starting at 1st level as a reaction you can spend a number of d10s equal to your sorcerer level to reduce the damage you take. You may spend a sorcery point to return the damage you absorbed back towards a creature of your choice within 30ft of you, this creature must make a constitution saving throw or take half as much damage.

You regain all uses of this feature when you finish a long rest

Vessel of Void

Starting at 6th level you gain a number of resistances equal to your proficiency bonus. This included physical damage and magical damage types except for radiant, force, or psychic damage. After you finish a long rest you can choose different resistances. You may spend a number of sorcery points to change these at any time in the day, one sorcery point for one resistance. You may also spend 3 sorcery points as a reaction to gain immunity from one damage type until the start of your next turn

Emptiness of Self

Starting at 14th level you have learned to unleash this emptiness. As a bonus action you can enter a state of emptiness for 1 minute, you gain the following benefit.

• Damage you do with your spells now heal you for the level of the spell(minimum 1)+your spell casting. 
• All your damaging is considered neurotic and cannot be resisted
• You regain all uses of your Void Soul ability while in this state, once the minute is over you lose all remaining uses of the ability. 

You can’t use this feature again until you finish a long rest of spend 5 sorcery points to use it again

Being of Void

Starting at 18th level, your presence drains all life around you. As an action you can transform your body into a black whole shaped like yourself, While in this form, you can not speak or cast spells, but you may concentrate and gain the following bonuses for 1 minute.

• You are resistant to all damage types.
• At the start of your turn a number of creatures within 30ft of you equal to your spellcasting modifier must make a Dexterity saving throw or be pulled or pushed away by 10ft.
• If a creature starts its turn within 15ft they must make a constitution saving throw or take 1d10 necrotic damage. 
• As an action you can make an attack roll using your spell casting modifier towards a creature within 30ft of you to inflict them with 4d10 necrotic damage that can not be resisted, the damage reduces your maximum hit point. 
• Half the necrotic damage you do you gain in temporary hit points.

At the end of the 1 minute you are paralyzed for 1 round, you retain all the temporary hit point you gained while in this form This lasts for 1 minute or you use a bonus action to dismiss the effect. 

You cannot use this feature again until you finish a long rest