Your race has been preparing for war and has become proficient in the use of heavy armor and various weapons.

As magic flows through your body, it causes physical traits of your draconic corruption to emerge. Your hit point maximum increases by 1 and increases by 1 again whenever you gain a level.

Additionally, parts of your skin are covered by a thin sheen of dragon-like scales. When you aren’t wearing armor, your AC equals 13 + your Dexterity modifier.

You gain the ability to sprout a pair of dragon wings from your back, gaining a flying speed equal to your current speed. You can create these wings as a bonus action on your turn. They last until you dismiss them as a bonus action on your turn.

You can’t manifest your wings while wearing armor unless the armor is made to accommodate them, and clothing not made to accommodate your wings might be destroyed when you manifest them.

Gain advantage on all throws.

Your race has mastered the arcane arts. As a result, they have created 3 spells: Arcane Lance, Arcane Wrath, and Arcane Annihilation.

Your kin prepared you well and taught you a variety of languages that you may encounter while exploring the far reaches of the world.

All attribute scores are increased by 20.

You gain Undead Fortitude if you are turned undead by excessive use of your forbidden knowledge.

Undead Fortitude:
If damage reduces the zombie to 0 Hit Points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Although elves reach physical maturity at about the same age as humans, the elven understanding of adulthood goes beyond physical growth to encompass worldly experience. An elf typically claims adulthood and an adult name around the age of 100 and can live to be 750 years old, but you are no typical elf. Your kinsmen have protected you with a powerful necromancy which created a backup of your physical form to act as a safeguard in the event of your death. Having been sent to the far flung corners of the world by your kinsmen for the advancement of your race, they are prepared to immediately return you to the land in which you were killed so that you may seek vengeance and continue your quest.

Your ancestors left behind the gods long ago when the dragons conquered their lands, but you serve no gods, nor masters. Your race has betrayed the living dragon gods of their lands and subverted the pact made to the eldritch horror so long ago, and now they are free to serve themselves in the eternal search for greater power.

Elves range from under 5 to over 6 feet tall and have slender builds. Your size is Medium.

Your base walking speed is 30 feet.

Due to the dark pact your ancestors made generations ago, you have proficiency in multiple skills necessary for your success as an agent of darkness. You also gain access to a wide selection of spells.

These spells can be cast at will, do not count against your prepared spells, and do not consume spell slots. Whenever you cast a spell using Forbidden Knowledge you take necrotic damage from Necrotic Exchange based on the spell's level, you cannot heal yourself with a spell, and the hit points restored by healing spells from others and potions are reduced to half the effect's value rounded up until you take a long rest.

At the beginning of each use your Writs of Forbidden Knowledge Ability, you cannot cast more than that many combined spell level's worth of spells in a day using Forbidden Knowledge (cantrips count the same a first level spell). If you cast the maximum number of spells allowed by forbidden knowledge in a day then your body begins to decay. The decay begins from your spellcasting hand and slowly works its way up your arm and then begins to spread over that side of your face and upper body. Add a stack of decay to your character sheet. For every day you abstain from using forbidden knowledge subtract a stack of decay. At 3 stacks of decay you become undead. At 5 stacks of decay you die outright.

As an undead, you can only be healed by taking a long rest. Once you become undead, you can no longer reverse the effects of the decay by simply abstaining from forbidden knowledge. If you die while subject to this decay then your body will only be returned to normal by a spell that explicitly heals missing body parts or replaces your body such as true resurrection or clone.

You can also use the quickened spell (cast a spell as a bonus action, only a cantrip can be cast as your additional spell that round of combat) and twinned spell (a single target spell can be rolled again and directed against an additional target) metamagic as a result of your corrupted bloodline. Use of metamagic applies the same damage as a second level spell cast as forbidden knowledge and counts against your maximum casts of spells using forbidden knowledge accordingly.

As a result of your Fey Ancestry, you have advantage on saves against being charmed, and magic can’t put you to sleep. You gain additional resistances to necrotic, fire, and psychic damage as a result of your bloodline's defilement over the generations as well as immunity to exhaustion. 

You don't need to sleep, but meditate semiconsciously for 2 hours a day. While meditating, you can dream after a fashion, but such dreams are generally interrupted by visions of the horrific things you and your ancestors did to achieve power. After resting in this way, you gain the same benefit that a human does from 8 hours of sleep, but can awaken prematurely and without consequence if you need to reassert your will over undead servants.

You can speak, read, and write Common, Elvish, Draconic, and Deep Speech as a result of your heritage and the dark alliances formed by your ancestors.