Umbra’s Claw

This item is one of a pair of malignant weapons made of dark leather and metal imbued with infernal magic. The other item is Umbra’s Mantle. 

Separate, each is dangerous and fearsome but when combined as they were destined to be, their fell magic awakens, making them deadlier still. If a character is attuned to both claw and cloak, both become Awakened and gain various improvements.

Wondrous item, very rare (requires attunement)

This claw is made from darksteel inscribed with profane glyphs. While wearing the claw, it counts as a simple melee weapon with the finesse property. You are proficient with it and it deals 1d8 slashing damage on a hit. It has the following magical properties:

• You have blindsight out to a range of 10 feet while wearing this claw.
• When you hit a creature with an attack roll using the claw, the creature becomes cursed for 1 minute or until you curse another creature in this way. While cursed by the claw, the creature takes 1d4 necrotic damage at the start of each of its turns. The target can then make a DC 15 Constitution saving throw, ending the effect on itself on a success.

Awakened. When the claw reaches an Awakened state, it gains the following properties:

• The range of your blindsight extends to 30 feet.
• The DC to end the claw’s curse increases to 17 and the necrotic damage dealt by it increases to 1d8.
• When you hit a creature that is currently cursed by this weapon with another attack using the claw, the curse grows in strength. After you hit it with a second attack, the cursed target can’t regain hit points. After you hit it with a third attack, the target must also roll a d4 and subtract it from any attack roll or ability check it makes while cursed in this way.