The Undying Goddess

The Undying Goddess was a mortal turned vampire who eventually ascended into godhood. In the time that she walked the mortal plane however she  created many cursed items that were imbued with her power causing whomever wielded them to be bound to her service willingly or not. Now that she is a goddess those items are a sign of her pact which can either be gifted by her willingly or found where ever they where by some unlucky fool. Along with being granted eldritch power there is is often a special effect imparted on you by the items,  it turns you slowly into some form of undead the changes care usually able to be seen physically.  The curse may potentially be broken however the effects are mostly unknown since it has rarely ever happened though if the curse is broken you may be free of the pact and might possibly even retain the eldritch magic that was gifted

Extended Spell List

1st	false life, command, inflict wounds
2nd	blindness/deafness, gentle repose
3rd	animate dead, bestow curse, revivify, speak with dead
4th	blight
5th	contagion, raise dead

 6th

harm magic jar

7th

resurrection

8th

abi-dalzim's horrid wilting, clone

9th

astral projection, true resurrection

A Contract Stronger Than Death

Starting at 6th level, you can activate a certain clause of the pact you entered into willingly or not to bring you back from death or the brink of it. When you activate this ability you are automatically put to 6 hit points no matter what your hit points were before. Once you do a burst of necrotic energy extends into a 6 foot radius dealing 3d6 necrotic damage. Whenever you use this ability it increases the progression of your curse in both physical and other aspects making you more likely to follow the will of your patron and stop fighting her control

Once you use this feature, you can’t use it again until you finish a long rest.

Undead Body's Aura

Starting at 10th level, you have have the magical ability to give your body all the same non cosmetic natural abilities as undead for 3 rounds or 3d6+6 minutes. For that time you are immune to death effects, disease, mind-affecting effects (charms, compulsions, morale effects, phantasms, and patterns), paralysis, poison, and sleep. Also if you are affected by any of these before activating the ability you will be cured of all except for death effects and disease that plus any charms compulsions or moral effects but you may roll at your DMs discretion to lessen these effects save for any sort of compulsions moral effects or charming that comes from your pact item. Using this only further adds to the progression of the curse that comes from your packed item further turning you into an undead GM's discretion to make a chart must roll a D100 to see how far the curse progresses

Undead Conversion

Starting at 14th level, when you reduce a enemy to less than 15% of their hitpoints you may roll to turn  into an undead if they fail a dc 15 saving throw by rolling a D100 from a list of Undead made at your DM's discretion to see what the enemy becomes as well as another D100 to see how much of it and or what parts of it are changed. Once this enemy is converted it is now considered an Ally and will fight for you and your party. If this newly-converted Ally survives the battle and is allowed to go free it will still retain loyalty and obedience to you and will not attack you if you ever meet again. This does not work however if the enemy you tried to convert is already Undead