Sorcerous Origin - Dark Bloodline

Your bloodline can be traced to an undead creatures of immense power. Usually this bloodline results from powerful undead creatures producing unholy unions with mortals. Sometimes the bloodline won't manifest for years with no indication, until some horrific event unveils the power that looms inside a creature expresses itself. 

From 1st level your heritage grants you access to additional spells. These spells do not count against your spells known.

1st: Inflict Wounds, Create or Destroy Water
3rd: Blindness/Deafness, Ray of Enfeeblement
5th: Corpse Explosion, Animate Dead
7th: Blight, Death Ward
9th: Danse Macabre, Infernal Calling, Planar Binding 

 Starting at 1st level, once per long rest you can link yourself to an undead creature you control as an action for a number of hours equal to your Sorcerer level or until you choose to end the effect as a bonus action. If your linked creature dies or you end the effect before you have used the full time, you may re-establish the link as an action. During this time you are aware of its location as long as it is on the same plane as you. Additionally the creature has resistance to all damage except radiant while linked to you. 

 At 6th level your Heritage allows you to manipulate the dark minions you control.
When an undead creature you control dies, you can use a reaction and expend sorcery points to reform the creature. The amount spent is equal to the level required to summon the creature initially. When an undead creature you control dies, your remaining undead creatures gain a +1 to attack, damage, and saving throws up to your Charisma modifier until you long rest. Any time you summon a creature its type changes to undead if it is not already. 

 At 14th level, when a creature within 60' of you dies from necrotic damage, you can then raise them as an undead you control. The creature you raise is a zombie or skeleton. You can only control a number of these creatures created by this effect equal to half your proficiency bonus.
Additionally when you deal necrotic damage you ignore resistance. 

 At 18th level, your control over the powers of your heritage fully matures and your other abilities grow even stronger
Your powers change in the following ways.
The bonus you can grant your undead creatures from Undead Power can now go up to double your Charisma modifier

1. Rising darkness now allows you to raise one ghoul per long rest
2. Creatures immune to necrotic damage now take half damage instead from your necrotic damage
3. Once per long rest, you can create a ghost that uses your spell dc saves for its abilities and your spell attack modifier for it's attacks. This ghost last until destroyed or until you complete a long rest.