Tortured Prodigy

Defenses

Saving Throws: Wisdom +3.

Damage vulnerability: Radiant damage and Physical damage from weapons coated with or made of silver.

Damage resistance: Psychic damage, simple Physical damage, and Necrotic damage.

Damage immunity: Poison damage.

Condition immunity: Bleeding and Exhaustion.

Characteristics

Descycle. When reduced to 0 hit points, the Tortured Prodigy must make a Constitution check with a DC equal to 10 or half the damage taken, whichever is higher. On a success, the Tortured Prodigy returns to 1 hit point; on a failure, it returns to its plane or place of origin.

This effect isn't triggered if it's destroyed as a result of sources that directly interact with the destruction of undead, such as the Spiritual Rite Acolyte's "Liturgy: Destroy Undead."

Empowerment. Whenever any creature is reduced to 0 hit points or dies within 30 feet of the Tortured Prodigy, it gains 1 Soul token.

Empower Attack. The Tortured Prodigy can spend its Soul tokens to increase the damage of its attacks by 1 die for every 7 Soul tokens spent.

Empower Effect. When the Tortured Prodigy uses an ability, it can choose to spend a number of Soul tokens as part of the activation action to enhance the effect based on the amount spent:

Spending 5 tokens increases the effect's duration by 1 additional turn.

Spending 15 tokens increases the effect's duration to 1 minute.

Spending 30 tokens increases the effect's duration to 10 minutes.

Spending 100 tokens makes the effect last for as long as the Tortured Prodigy wishes (the effect ends if the Tortured Prodigy is reduced to 0 hit points).

Mist Wraith. This undead is native to the Black Mist and is positively affected by it.

Object Manipulation. The Tortured Prodigy is able to carry and wield equipment and can add its proficiency bonus to attack rolls made with that equipment.

Gifted Musician. The Tortured Prodigy has 15 Mana points, which it can use both to cast spells from the Sound elemental mystery and to perform Melodies from the Artist: Musician Craft. The Tortured Prodigy's spellcasting attribute is Charisma, and its maximum spellcasting level is 2.

Known Spells: Thunder, Cacophony, Thunderwave, and Shatter.

Known Melodies: Aria of Perseverance, Song of Celerity, and Hymn of Valor.

Attacks

Necrotic Touch. Melee Natural Weapon Attack, +4 to hit, 5 ft. reach, one target. On a hit, deals 2 Bludgeoning damage + 25 (5d8+3) Necrotic damage.