Ancient Night Twist

Death Curse. When the night twist dies, if its death was at the hands of another creature, the creature who dealt the final damage responsible for killing the night twist must succeed on a DC 25 Wisdom Saving Throw or be cursed by the night twist. A creature cursed in this way is wracked with nightmares which inflict 5 (1d10) psychic damage each night while the creature is sleeping. The victim is also denied the benefits of a long rest, and must make a DC 10 saving throw to avoid exhaustion. The DC increases by 1 for each night the creature remains cursed. A creature who does not sleep is immune to the curse, however, elves are still subject to its effects during meditation. The only way to remove the curse is the casting of a remove curse spell or equivalent during the victim’s slumber while they are plagued with nightmares. If the victim dies while under the curse, a new night twist springs from their corpse after one month. The new night twist sapling appears to be a normal plant until it reaches maturity.

Despair Song. Every evening, a night twist emits a sorrowful sound that inspires melancholy and despair in all creatures who can hear with an Intelligence score of 6 or higher within one mile. All creatures who hear the song must succeed on a DC 22 Wisdom saving throw or be charmed by the night twist’s despair song. Creature’s affected by the song have disadvantage on attack rolls, skill checks, and saving throws. They are also compelled to seek the source of the song (the night twist) and will neglect all other tasks or needs in order to do so. If physically prevented from seeking out the night twist, the affected creature takes 5 (1d10) psychic damage every evening until it dies or until the charm is removed. This damage also reduces the creature's maximum hit points by the amount taken and cannot be prevented in any way. Relocating the victim outside the area affected by the night twist’s song does not end the enchantment. The song also ends immediately once the night twist makes a slam attack against the target, or if the night twist is destroyed. A creature who succeeds on their saving throw is immune to the despair song for the next 24-hours.

False Appearance. While the night twist remains motionless, it is indistinguishable from a normal tree.

Unholy Grace. The night twist adds its Charisma modifier as a bonus to all its saving throws and to its armor class. 

Legendary Resistance (3/Day). If the night twist fails a saving throw, it can choose to succeed instead.

Innate Spellcasting. The night twist’s innate spellcasting ability is Charisma (spell save DC 22, +14 to hit with spell attacks). It can innately cast the following spells, requiring no material components:

At will: gust of wind

1/day: Weird

3/day each: blight, Circle of Death, darkness, entangle, fear

5/day: phantasmal killer

Multiattack. The night twist makes three slam attacks and may then cast gust of wind.

Slam. Melee Weapon Attack: +14 to hit, reach 30 ft., one creature. Hit: 28 (4d8 + 10) bludgeoning damage.

The night twist can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The night twist regains spent legendary actions at the start of its turn.

Slam. The night twist makes one claw attack.

Move. The night twist moves up to half its speed.

Cast a Spell (Costs 2 Actions). The night twist uses Spellcasting.