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

Chilling presence. A nightshade chills the air within a radius of 60 ft. regardless of weather and temperature conditions. This permeates solid substances and can be felt through walls or through the ground. It also spoils all consumable items within 60 ft., affecting food, water, holy water, and even magical potions, oils and ointments, which are rendered disgusting and powerless, even though not poisonous.

Annihilating Aura. Any creature that starts its turn within 30 feet of the nightshade must succeed on a DC 23 Constitution saving throw or take 14 (4d6) necrotic damage and grant the nightshade advantage on attack rolls against it until the start of the creature’s next turn. Undead are immune to this aura.

Life Eater. A creature reduced to 0 hit points from damage dealt by the nightshade dies and can’t be revived by any means short of a wish spell.

Daylight sensitivity. During the day and under natural daylight, a nightshade has disadvantage on attack rolls.

Limited Magic Immunity. The nightshade can't be affected or detected by spells of 6th level or lower unless it wishes to be. It has advantage on saving throws against all other spells and magical effects.

Poisonous touch. The mere touch of a nightshade subjects the victim to a necrotic poison that deals an extra 4d6 (14) poison damage on a hit (included in the attacks).

Innate Spellcasting. The nightcrawler's spellcasting ability is Charisma (spell save DC 20). The nightcrawler can innately cast the following spells, requiring no material components:

At will: charm person, cloudkill, confusion, darkness, dispel magic, haste, hold person, invisibility

1/day each: finger of death

Multiattack. The nightcrawler makes two attacks: one with its bite and one with its stinger.

Bite. Melee Weapon Attack: +16 to hit, reach 10 ft., all targets within a 5 ft. radius. Hit: 25 (3d10 + 9) piercing damage plus 4d6 (14) poison damage. If the target is a Large or smaller creature, it must succeed on a DC 23 Dexterity saving throw or be swallowed by the nightcrawler. If it is a Small or smaller creature, it has disadvantage on the saving throw. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the nightcrawler, and it takes 21 (6d6) necrotic damage  plus 4d6 (14) poison damage at the start of each of the nightcrawler's turns.

If the nightcrawler takes 30 damage or more on a single turn from a creature inside it, the nightcrawler must succeed on a DC 21 Constitution saving throw at the end of that turn or regurgitate all swallowed creatures, which fall prone in a space within 10 feet of the nightcrawler. If the nightcrawler dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.

Tail Stinger. Melee Weapon Attack: +16 to hit, reach 10 ft., one creature. Hit: 19 (3d6 + 9) piercing damage, and the target must make a DC 23 Constitution saving throw, taking 42 (12d6) poison damage on a failed save, or half as much damage on a successful one.

Summon Undead (1/ Short Rest). The nightcrawler attempts a magical summoning. A nightcrawler has a 75% chance of summoning undeads. Roll 1d8:

• 1-3: 1d4+1 shadows
• 4-5: 1d2 specters
• 6: 1 ghost
• 7: 1 wraith
• 8: 1 bodak

A summoned undead appears in an unoccupied space within 60 feet of its summoner, acts as an ally of its summoner, and can’t summon other undead. It remains for 1 minute, until it or its summoner dies, or until its summoner dismisses it as an action.

A nightcrawler 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. A nightcrawler regains spent legendary actions at the start of his turn.

Attack. The nightcrawler makes one Tail Stinger attack.

Charge. The nightcrawler burrows up to its speed without provoking opportunity attacks.

Reduction Curse (Costs 2 Actions). The nightcrawler curses one creature he can see within 60 feet of him. The target must succeed at a DC 23 Charisma saving throw or be Reduced, as per the enlarge/reduce. The target's size is halved in all dimensions, and its weight is reduced to one-eighth of normal. This reduction decreases its size by one category--from Medium to Small, for example. Until the spell ends, the target also has disadvantage on Strength checks and Strength saving throws. The target's weapons also shrink to match its new size. While these weapons are reduced, the target's attacks with them deal 1d4 less damage (this can't reduce the damage below 1). Contrary to the spell, the curse is cumulative and can affect the same target up to three times.

Trembling Strike (Costs 2 Actions). The nightcrawler strikes the ground with its massive body, triggering an earth tremor. All other creatures on the ground within 60 feet of the empyrean must succeed on a DC 23 Strength saving throw or be knocked [condition]prone[condition].

Cast a Spell (Costs 3 Actions). The nightcrawler casts one of his innate spells.