Amulet of Blood Magic

The amulet has silver chain with carvings the color of blood of a true vampire draining blood from many different mortals. It has a small vile with a needle protruding from the end of it. When you attune to it you must make a DC 15 constitution saving throw or fail the attunement and take 1d10 necrotic damage as the blood in the vile turns black and vaporizes. It has 12 charges and regains 1d12 charges at sunset. 

When attuned the wearer has access to the cantrip chill touch. The wearer may expend 1 charge to cast one of these spells: False Life, Inflict Wounds, or Ray of Sickness. The wearer may expend 3 charges to cast Vampiric Touch. If the wearer would like to cast any of the spells provided by the amulet they must pay an extra number of charges equal to the number of levels they go up by. They also must make a constitution saving throw equal to 12 plus the number of charges spent for the spell or the spell fails and they take xd6, where x is the number of charges spent, necrotic damage.

Disease Blood. The wearer may expend 6 charges to choose target creature they can see within 60 feet. That target must make a DC 17 constitution saving throw, on a fail they take 5d6 necrotic damage and  are diseased. While diseased the target takes 1d6 necrotic damage every turn and may remake the saving throw at the end of each of its turns. On a success the damage is split as evenly a possible between the target and the wearer and no one is diseased.

Blood Aura. The wearer may expend 6 charges to create an aura of bloody mist around them in a 15 foot sphere centered on them anyone that starts their turn there or enters it for the first time takes 1d8 necrotic damage. The aura lasts for 1d4 minutes plus one for every 10 damage dealt by the mist, if 50 damage is dealt by the mist then the area in it becomes lightly obscured and only the wearer can see through it, if 100 damage is dealt by the mist then it is heavily obscured and only the wearer can see through it.

Transformation of Blood. The wearer may expend 12 charges to target the 10 closest creatures they can see and red waves of misty energy will reach out toward them all of them must make constitution saves the DC is equal to is equal to half of all of the creatures con scores combined, if the DC is below 15 then the wearer can spend hit points to add 1 higher DC per 5 hit points. on a fail they take 6d12 necrotic damage and are diseased (see Disease Blood) however substitute the d6s for d12s. On a success the damage is split evenly between them and the wearer and they are diseased normally. the save for being diseased cannot be redone. when 150 damage total has been dealt, if the wearer has not died, they transform into a true vampire, however they have the Disease Blood and Blood Aura abilities.

Curse. As soon as someone attunes to this amulet the true vampire seen on the chains of the amulet becomes aware of their location and will stop at nothing to hunt them down. when the Transformation of Blood is complete that vampire seizes to exist and the wearer becomes them. Every time the wearer uses an ability or spell provided by the Amulet of Blood Magic they will make a constitution saving throw but don't tell  them what it is for. The DC should be 8 + how many times they have made this saving throw. If they fail they take a number of d6s equal to there constitution modifier and you should say something like, "you see your fingernails grow a little longer", "your skin looks a little paler", "you feel your k-9s grow a little", or "you feel a little bloodlust". When they fail foe the 10th time they will have a 1d4 + strength bite attack and will feel inclined to use Transformation of Blood. After 15 fails they feel a need to use it and must make a DC 17 wisdom saving throw or do so. At 20 fails they are forced to use it as soon as possible.

Notes: Natural Weapon: Piercing, the amulet is destroyed when Transformation of blood is used., Damage, Combat, Cursed, Necklace, Jewelry, transmutation