Báisteach Fuil

This ancient Elvish sword was originally wielded by Taranis, the first Bloodletter and sworn protector of King Arawan during the Ré Ársa. Translating to "Blood Rain" in common, Báisteach Fuil is a powerful weapon that was cursed by Taranis with her last breath as she laid dying on Manannan's sword, having failed to protect her king.

You gain a +2 bonus to attack and damage rolls made with this magic finesse weapon. Additionally, any necrotic damage dealt by the sword ignores resistances and treats immunities as resistances.

Curse. This blade is constantly thirsting for blood and must be sated once awakened. When unsheathed, the creature attuned to it suffers 1d10 necrotic damage at the start of their turn. While in combat, every turn in which you do not attack, you take damage according to this weapon's curse. The creature attuned to this weapon cannot easily part with it and will never allow it to be more than 5 feet away. Any attempt to unattune from the item forces the creature to make a DC 17 Wisdom saving throw. On a failed save, the creature suffers 4d10 necrotic damage, and the creature fails to unattune to the item. On a successful save, the creature manages to separate itself from the sword.

Selfish Strength. When your attack is a critical hit, you heal for half of the damage dealt. You cannot be healed by any outside sources, such as healing spells or potions, but you can still heal yourself using any of your features, attuned items, a short rest, or a long rest.

Bloodletter's Calling. As the chosen weapon of the first Bloodletter, Taranis, this sword has several abilities that are fueled by the Bloodletter's blood points:

• Coagulated Blood (3 Blood Points). As an action, you spend 3 blood points and form a thick, viscous armor made of blood around you. Roll 1d6 and add the result to your Armor Class. This lasts for 1 minute.
  
  
• Vengeful Blood (3 Blood Points). As a bonus action, you spend 3 blood points to empower yourself with self-consuming hatred. For 1 minute, Báisteach Fuil deals an additional 1d8 necrotic damage. For the duration, you take an equal amount of necrotic damage every time you damage a creature with this weapon.
  
  
• Purified Blood (5 Blood Points). As an action, you spend 5 blood points and cast the spell greater restoration on yourself.
  
  
• Cursed Blood (5 Blood Points). As an action, you spend 5 blood points and strengthen the blade's debilitating curse. The next time you hit a creature, it is affected by the spell flesh to stone (DC 17).
  
  
• Immortal Blood (10 Blood Points). As a reaction, you spend 10 blood points and reduce any incoming damage to 0
  
  
• God-Slaying Blood (10 Blood Points). As an action, you spend 10 blood points and allow Báisteach Fuil to slay anything, using your blood as a catalyst. Your next attack deals an additional 20d8 necrotic damage, but you take an equal amount of damage.

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

Notes: Bonus: Magic, Weapon Property: Finesse, Bloodletter, Damage, Combat, Cursed, Versatile, Sap