Wondrous Item
Legendary Requires Attunement
While attuned to Goblet of the Soul Thief you can speak, read and write infernal and gain the following abilities.
Soul Harvest. As an action, while within 10-feet of a humanoid creature that died less than 1-minute ago, harvest the creature's soul. The opaque soul floats into the goblet before becoming trapped and causing the goblet to bubble as if a hot liquid was inside. The goblet can hold up to 5 souls.
Drink Deep. As an action, drink from the goblet of the soul thief. If the goblet contains souls, gain an amount of temporary hit points equal to 1d6 per soul, and the soul is expended. When drinking deep, you must drink the full contents of the goblet, consuming all souls in the process.
Awakened
When a character awakens this item, apply the following changes to the item's traits.
Increase the temporary hit points gained from Drink Deep to 1d8 per soul.
Beyond the Grave. As an action, you can expend a number of souls to cast the following spells, using your spell save DC: speak with dead (2 souls), animate dead (3 souls), raise dead (5 souls).
Exalted
When a character exalts this item, apply the following changes to the item's traits.
Goblet of the Soul Thief can now hold up to 6 souls.
Summon Devil. As an action, expend a number of souls to summon a devil from the list below. Any devil you summon with Goblet of the Soul Thief is friendly to you and your allies for the duration. The devil obeys any verbal commands you issue and returns to their home plane 10-minutes after being summoned. You can only have one devil summoned at a time.
Available Devils: Imp (2 souls), Spined Devil (3 souls), Bearded Devil (4 souls), Barbed Devil (6 souls)