Hidden in the dungeon of White Plume Mountain, Blackrazor shines like a piece of night sky filled with stars. Its black scabbard is decorated with pieces of cut obsidian.
You gain a +5 bonus to attack and damage rolls made with this magic weapon. It has the following additional properties.
When you attack a creature that has at least one head with this weapon and roll a critical hit on the attack roll, you cut off one of the creature's heads. The creature dies if it can't survive without the lost head. A creature is immune to this effect if it is immune to slashing damage, doesn't have or need a head, has legendary actions, or the DM decides that the creature is too big for its head to be cut off with this weapon. Such a creature instead takes an extra 12d6 slashing damage from the hit.
Devour Soul
Whenever you use it to reduce a creature to 0 hit points, the sword slays the creature and devours its soul, unless it is a construct or an undead. A creature whose soul has been devoured by Blackrazor can be restored to life only by a wish spell.
When it devours a soul, Blackrazor grants you temporary hit points equal to the slain creature’s hit point maximum. These hit points fade after 24 hours. As long as these temporary hit points last and you keep Blackrazor in hand, you have advantage on attack rolls, saving throws, and ability checks.
Whilst attuned to Blackrazor you have resistance to force, radiant and necrotic damage.
Soul Hunter
While you hold the weapon, you are aware of the presence of Tiny or larger creatures within 60 feet of you that aren’t constructs. You also can’t be charmed or frightened.
Blackrazor can cast the haste spell on you at will. It decides when to cast the spell and maintains concentration on it so that you don’t have to.
Blackrazor deals an additional 4d6 force damage.
Sentience
Blackrazor is a sentient chaotic neutral weapon with an Intelligence of 17, a Wisdom of 10, and a Charisma of 19. It has hearing and truesight out to a range of 120 feet.
The weapon can speak, read, and understand Common, and can communicate with its wielder telepathically. Its voice is deep and echoing. While you are attuned to it, Blackrazor also understands every language you know.
Personality
Blackrazor speaks with an imperious tone, as though accustomed to being obeyed. However, it has a strange obedience when Zenrann commands it
The sword’s purpose is to consume souls. It doesn’t care whose souls it eats, including the wielder’s. The sword believes that all matter and energy sprang from a void of negative energy and will one day return to it. Blackrazor is meant to hurry that process along.
Despite its nihilism, Blackrazor feels a strange kinship to Wave and Whelm, two other weapons locked away under White Plume Mountain. It wants the three weapons to be united again and wielded together in combat, even though it violently disagrees with Whelm and finds Wave tedious.
Blackrazor’s hunger for souls must be regularly fed. If the sword goes three days or more without consuming a soul, a conflict between it and its wielder occurs at the next sunset. This property can be overpowered if Blackrazor feels subservient to its wielder
Proficiency with a Rapier allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Vex. If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.
Notes: Bonus: Magic, Resistance: Necrotic, Resistance: Force, Resistance: Radiant, Damage: Force, by Zenrann, Finesse, Vex