Blight Eater

The dark arts of necromancy has been in the world for as long as the Gods of Death have had followers, and the thought itself has been their ever since death was realized. With necromancy comes chaos, and with chaos comes war and to combat this, as many people have quoted, "One must fight fire with fire" and in this sense it is fighting the dead with the dead. A monastery known as the Emerald Library was struggling to protect itself from a necromancer who had destroyed the town before.

Because of this, the monastery leader, Abbot Elder D. Mafilid, a proud necrotic studier and radiant magic user had begun to plot. Summoning a powerful demon, only to seal him in a demi-plane known as the Infinite Crypt which actively stole portions of his magic over time to power himself. Instead of becoming crazy with necrotic potentiality, he created a completely new form of species known as Blight Serpent. 

These creatures are able to eat necrotic energy, and as he created one, more spread, infecting the lands and slowly draining the necrotic energy in the land.

Counter Spells

You learn additional spells when you reach certain levels in this class, as shown on the Counter Necrotic Spells table. Each of these spells counts as a sorcerer spell for you, but it doesn’t count against the number of sorcerer spells you know.

Whenever you gain a 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 Abjuration spell from the sorcerer, warlock, or wizard spell list.

Bain Of Necromancy

The Blight Eaters energy empowers you, and with its anti-necrotic energy, you grain a advanced anti-necrotic ability. 

At 1st level, you gain a resistance to necrotic damage, and have an aura the repels necromantic energy, causing all undead enemies in 30 ft. to gain disadvantage on attack rolls and all necrotic spells used within 30 ft. gain disadvantage and deal half damage. Additionally, using a Sorcery Point, you can automatically cast Dispel Magic once per long rest, only on necrotic element spells. 

Blight Serpent Summoning

At level 6, you gain the ability to meet your Blight Serpent Companion in person, allowing you to summon it during battles to assist you.

Blight Serpents use the Blight Serpent homebrew stat block. Its turn is after yours and it is fully sentient, and when it dies, it is only its physical form as it takes 1 day to regenerate its body. It can answer certain questions, and generally talk to you. It stays with you until it dies, or after 5 hours, from then it also takes a day to regenerate, as such you can only use it once a day.

Necrotic Devour

At 6th level, the Blight Serpent within you grants you its abilities, allowing you to become more powerful.

As a reaction to a necrotic spell or action at you, you can devour the spell much like the Blight Serpent within you, allowing you do consume the spell for half the damage as health, or reverse it back to a target. Additionally, you gain complete immunity to Necrotic damage and necrotic enemies, producing a new aura of Necrotic Warding, causing all undead targets to take 3d4 radiant damage and gain disadvantage on all rolls. 

Additionally, if any Undead creatures are within 200 ft. of range, you can sense them, and are drawn to them.

Necrotic Infect

At level 14, your necrotic parasite allows you to use necrotic energy on your enemies, infecting them with what was once theirs, and causing complete chaos.

You gain access to three Necrotic Infections shown below.

Blighted Bloat. The Blight Serpent lashes out and biting an enemy. Said enemies' body begins to bloat in bright green clusters of necrotic energy. They take 2d6 necrotic damage and receive a 15 ft. movement speed decrease, loss of the Dodge action, and become to heavy to fly. After they bloat, dealing 15+ damage will cause their Blight Bloats to burst, dealing 6d6 necrotic damage to ALL creatures within a 30 ft. radius, after a Constitution save (DC15), as well as 3d4 force damage to the creature who was originally inflicted. If they pass, they only take 3d6 necrotic damage. Every turn someone is in this radius takes 2d8 poison damage. 

Necrotic Lock. The Blight Serpent lashes out and biting an enemy. This enemies body begins to pulse with necrotic energy, inflicting the petrify effect, causing them to stay in whatever position they were in. If the target is flying, for every 5 ft. they were in the air they take 1d8 force damage. Petrified enemies must make a Strength Save (DC18). Petrified enemies can also be controlled by you, only being able to attack, move (with a -10 to walk speed), as well as other small actions.

Grasp of the Damned. The Blight Serpent lashes out and biting an enemy. More Blight Serpents as well as skeletal necrotic hands grasp out the ground, reducing the target movement speed to 0. These hands constantly inflict Life Drain, dealing 2d6 necrotic damage every turn. The person must make a Strength Save (DC15), every turn to stop this from happening, as well as a Constitution Save to get the Blight Serpents of them.

You can use Blighted Burst once per long rest, Necrotic Lock 4 times per long rest, and Grasp of the Damned twice per long rest. All of these have a 50 ft. of range.

Seek the Nightmares

At 18th level, you can use 5 Sorcery Points to activate Seek the Nightmares, which instantly makes you appear as all your enemies worst nightmares, dealing 4d12 psychic damage and must make a Intelligence Save (DC18), which failing gives the Freighted effect. Additionally, you can transform into a creature with a CR 12 or bellow. You gain their size, attacks and attributes for 1 hour.

You can activate this once per long rest, and if you choose to transform into a larger creature, your body is covered in theirs and when "you" die, you become unconscious. If you are smaller, you spring up and become unconscious.