Unleashed Spirits

Defenses

Damage Threshold: 6

Saving Throws: Dexterity +4, Wisdom +2.

Damage vulnerability. Radiant damage and physical damage from weapons coated in or made of silver

Damage resistance. Psychic, simple physical, and Necrotic damage.

Damage immunity. Poison.

Condition immunity. Bleeding and Exhaustion.

Characteristics

Shifting. With a free action at the start of its turn, the Unleashed Spirit can become intangible, gaining immunity to simple physical damage, resistance to Force damage, and immunity to the Paralyzed and Petrified conditions, but becoming unable to deal any physical damage, and can return to its tangible form at the start of its next turn. While in its intangible form, the Unleashed Spirit becomes vulnerable to Force damage.

Seven Feet from Death. The Unleashed Spirit doesn't have Hit Points like other creatures; instead it has 7 vitality tokens and a damage threshold of 6. Whenever it takes damage equal to or greater than its damage threshold, the Unleashed Spirit loses one vitality token. For every 3 vitality tokens lost, the Unleashed Spirit gains +1 to AC, saving throws, attack rolls, and damage.

Ethereal Body. The Unleashed Spirit can use an action to become invisible until it takes damage, makes an attack roll, or forces a saving throw.

Descycle. When its vitality tokens are reduced to 0, the Unleashed Spirit must make a Constitution check with a DC equal to 10 or half the damage taken, whichever is higher. On a success, the Unleashed Spirit returns with 1 vitality token; 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 "Liturgy: Destroy Undead" from a Spiritual Rite Acolyte.

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

Last Breath (Reaction). When it takes damage that would reduce its vitality tokens to 0, the Unleashed Spirit can use its reaction to negate that damage and rise again. When doing so, it can choose to reduce its damage threshold by an amount of its choice, causing a necrotic explosion in a 15-foot radius around it. Creatures in the area must succeed on a DC 10 Constitution saving throw or take a number of d8 Necrotic damage equal to the value reduced from its damage threshold, and become Paralyzed until the end of their next turns.

Attacks

Ethereal Touch. Melee Natural Weapon Attack, +4 to hit, 5 ft. reach, one target. On a hit, deals 5 (1d6+2) Force damage.