Cold-Blooded

At 1st level, your affinity with serpents grants you a measure of their hardiness. You can go without food for a number of days equal to 3 + your Constitution modifier (minimum 1) + your proficiency bonus before you suffer the effects of starvation. You also have advantage on saving throws against poison and disease.

Also at 1st level, when you use magic to trick or deceive, the residual energy of your spell subtly alters how others perceive you. When you cast an illusion spell using a spell slot of 1st level or higher, you have advantage on Charisma (Deception) and Charisma (Persuasion) checks for the duration of the spell and for 10 minutes after the spell's duration ends.

Starting at 6th level, even when a creature resists your unsettling allure, your presence gets under their skin. When you cast an enchantment or illusion spell using a spell slot of 1st level or higher, and your target succeeds on its saving throw against your spell, your target becomes charmed by you until the start of your next turn. If the spell you cast affects multiple targets, only one of those targets can be affected by this feature.
You can use this feature a number of times equal to your proficiency bonus. You regain all expended uses when you finish a long rest.

At 14th level, you sap the will and resolve of creatures that are under your sway. If you start your turn with at least one creature within 30 feet of you that is currently charmed, frightened, paralyzed, restrained, or stunned by a spell you cast or a magical effect you created, such as from a magic item, you can use your reaction to force each such creature to take 6d4 psychic damage.
You can use this feature a number of times equal to your proficiency bonus. You regain all expended uses when you finish a long rest. If you have expended all your uses of this feature, you can spend 5 sorcery points at the start of your turn to use it again.

Starting at 18th level, when you fail a saving throw against being charmed, frightened, paralyzed, restrained, or stunned by a spell or other magical effect, you can use your reaction to force the creature that cast the spell or created the magical effect to succeed on a saving throw against your spell save DC or suffer the same condition for the same duration.
If both you and the creature that targeted you are affected by a condition as a result of this feature and that condition allows for subsequent saving throws to end the effect, the condition ends for both of you if either one of you succeeds on a subsequent saving throw.