Amulet of Demon Binding

Description:

This dark, ominous amulet has an intricate design of twisted metal and glowing runes. It feels cold to the touch and exudes a faint aura of malevolent power.

Abilities:

1. Demon Capture:
   • Activation: As an action, the wearer can use the amulet to attempt to capture a demon within 30 feet. The target demon must make a Charisma saving throw (DC = 8 + proficiency bonus + Intelligence modifier of the wearer). On a failed save, the demon is drawn into the ring and trapped within it. The ring can hold only one demon at a time.
   • Limitations: Only demons of CR equal to or lower than the wearer’s level can be captured. Demons with legendary resistance can choose to use it to automatically succeed on the saving throw.
2. Release Demon:
   • Activation: As an action, the wearer can release the trapped demon. The demon appears in an unoccupied space within 30 feet of the wearer and is hostile to all creatures. The demon remains free for 1 hour or until it is reduced to 0 hit points, after which it returns to the ring. If the ring is destroyed or the demon is released through another means, the demon is permanently free.
3. Demon’s Power:
   • Benefit: While a demon is trapped in the ring, the wearer gains resistance to fire and poison damage and advantage on saving throws against being charmed or frightened.
   • Drawback: The demon's malevolent influence seeps into the wearer’s mind. The wearer has disadvantage on Wisdom saving throws and perception checks.

Negative Effects:

1. Corruption:

   • Each time the wearer uses the ring’s demon capture ability, they must make a Wisdom saving throw (DC 15). On a failure, their alignment shifts one step towards chaotic evil. This change is temporary (lasting 24 hours) but becomes permanent if the wearer fails three saving throws in this manner.

2. Nightmares:

   • While attuned to the ring, the wearer is plagued by horrific nightmares when they sleep. Each long rest, the wearer must make a Wisdom saving throw (DC 10). On a failure, they gain no benefit from that long rest.

3. Demonic Whisper:

   • The trapped demon can communicate telepathically with the wearer. It constantly whispers tempting offers, dark secrets, and sinister suggestions. The wearer must make a Wisdom saving throw (DC 13) each time they receive such a communication. On a failure, they must act on one of the demon’s suggestions within the next hour, interpreting it in the most destructive way possible.

Destruction:

The ring can be destroyed by a wish spell or by being submerged in holy water for a year. Destroying the ring releases any demon trapped inside, which becomes free and uncontrolled.

Notes: Resistance: Acid, Wondrous Item, very rare (requires attunement)