Amaryllis

This sentient hellish looking sword features a jet black serrated blade that has strange glowing red runes on it. The runes say "From hell's heart, I stab at thee" and are always glowing red. The hilt features a jet black skull with horns and ruby eyes. The handle looks to be wrapped with chain and spiked guard. Amaryllis belonged to Feirrin, Queen of the Erinyes.

Devil's Soul

You have a +3 bonus to attack and damage rolls made with this magic weapon. It scores a critical hit on a roll of 19 or 20, and deals an extra 2d10 slashing damage to Fiends. Additionally while attuned to this sword you can speak Infernal and Abyssal and have resistance to attacks made by Fiends.

This weapon has 9 charges, you can use the charges to cast the following spells: 

Summon Greater Demon- 2 charges

Infernal Calling- 2 charges

Finger of Death- 4 charges

Shadow of Moil- 3 charges

Eyebite- 3 charges

Power Word Kill- 6 charges

Imprisonment- 5 charges

Spell DC 20 and all spells are cast at the highest level. All spent charges are regained at dawn.

Sentience

Amaryllis is a Chaotic Evil sword with an Intelligence of 15, a Wisdom of 13, and a Charisma of 17. It has hearing and darkvision out to a range of 120 feet.

The weapon communicates telepathically with its wielder and can speak, read, and understand Common and Infernal.

Personality

Amaryllis seeks to destroy all fiends, killing demons and devils alike. Her original leader, Feirrin, was betrayed by devils. Demons have always been natural enemies of devils so their destruction comes naturally to the weapon.

Random Properties

Amaryllis has the following random properties:

• 2 minor beneficial property
• 2 major beneficial property

Destroying the Sword

Amaryllis can only be destroyed by wish spell cast by an Archdevil. Nothing else, not even a wish spell cast by another type of creature, can damage this magic sword.

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, Damage: Slashing, Language: Abyssal, Language: Infernal, creature of Evil Alignment, Damage, Combat, Versatile, Sap