Bachiyr

This Black steel longsword is split to have two blades till 3" from the hilt here there sits what appears to be a glass vial between the two blades. The origins of this blade are unknown, but its cold steel gives way to its nature.

Once attuned a curse extends to the wielder, the harvesting of the souls and lifeforce of any creature the weapon strikes. The more souls the wielder claims the more the wielder seeks to claim looking to land the killer blow. The wielder can not be willing unattuned from Bachiyr.

Bachiyr can only be destroyed by a Wish spell or similar spell, a Remove Curse spell can end the wielder's attunement but will still thirst for the soul fragments unless they are the target of a Greater Restoration Spell or similar.

This magic sword grants a plus 2 to attack and damage rolls dealing 1d10+2 slashing damage and 2d6 Necrotic damage.

Bachiyr has 2 charges with all charges returning after a long rest

Spending 1 Charge as a bonus action, Bachiyr can absorb the necrotic damage it dealt on its last attack, healing the wielder. 

Bachiyr requires attunement, when a creature attunes to this weapon,  a counter begins. Each time a creature is reduced to 0 hit points there is a chance a fragment of the creature's soul is absorbed by Bachiyr (Roll a D20 on a 15-20 a soul fragment is absorbed) the more souls Bachyir absorbs the more powers Bachiyr grants its wielder. The wielder's Charisma is the modifier used for any spell granted by Bachiyr.

• 5 Soul Fragments: Bachiyr gains 1 extra charge and spending 1 charge as an action has the ability to cast Inflict Wounds at its lowest level.
• 10 Soul Fragments: Spending 1 charge as a bonus action black shadows form around Bachiyr, for 1 minute Bachiyr deals 1 extra Necrotic damage die, the shadows can be dismissed with a bonus action.
• 15 Soul Fragments: The Dark Father that created Bachiyr will start to influence the wielder and souls are no harvested on a 12 or above. Bachiyr gains an extra charge.
• 20 Soul Fragments: Spending 1 Charge as an action has the ability to cast Whither and Bloom at the point Bachiyr touches the ground or Ray of Sickness if targeting a creature at their 2nd spell level.
• 25 Soul Fragments: The Dark Father that created Bachiyr exerts more influence the wielder will seek souls with more zeal than before, and souls will be harvested on a roll of 10. A Remove Curse spell is no longer effective on Bachiyr only a Greater Restoration spell will work, once to end the attunement, once to remove the souls and once to remove the Dark Father's influence. After every soul that is now harvested the wielder must make a Wis DC12 save or move further to the Dark Father's side, and will slowly begin a transformation. (On the first failed save the wielder starts to become cold to the touch and people become distrusting of their demeanour (disadvantage on Charisma checks) On the second failed save the wielder gains an aversion to sunlight (sunlight sensitivity) On the third failed save the wielder gains an even greater thirst for souls and must roll twice when harvesting and must take the higher number. Bachiyr gains a charge.
• 30 Soul Fragments: The Dark Father's enforcer is complete souls are now harvested on a roll of 5 and within 1d20 hours or the next soul harvest, whichever is sooner the wielder will transform into a Vampire, this conversion can only be reversed by a Wish spell, Divine intervention or similar spell.

 

 

Proficiency with a Longsword allows you to add your proficiency bonus to the attack roll for any attack you make with it.

Notes: Attunement Required, Versatile, Sap