Armor of Shadows. When the nightcrawler is in dim light or darkness and wearing no
armor and wielding no shield, its AC includes its Charisma modifier.

Consussive Demise (3/Day). When the nightcrawler reduces a creature to 0 hit points, it causes an explosion of necromantic energy bursts from it. Each creature within 10 feet of the dying creature must succeed on a DC 22 Dexterity saving throw, taking 33 (6d10) necrotic damage on a failed save, or half as much damage on a success.

Improved Desecrating Aura. The nightcrawler can activate or deactivate this feature as a bonus action. While active, other undead creatures within 120 feet of it make attack rolls with advantage, are resistant to all damage, and cannot drop below 1 hit point. The aura is suppressed while the nightcrawler is in an antimagic zone or in an area of bright light.

Innate Spellcasting. The nightcrawler’s innate spellcasting ability is Charisma. It can innately cast the following spells (spell save DC 20, +12 to hit with spell attacks), requiring no verbal or material components:

At will: blight, contagion, darkness, dispel magic

3/day each: confusion, darkest night

1/day each: circle of death, plane shift

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

Magic Resistance. The nightcrawler has advantage on saving throws against spells and other magical effects.

Shadow Blend. While in dim light or darkness, the nightcrawler can use a bonus action to become invisible, along with anything it is wearing or carrying. The invisibility lasts until the nightcrawler uses a bonus action to end it or until the nightcrawler attacks, is in bright light, or is incapacitated.

Sunlight Hypersensitivity. The nightcrawler takes 20 radiant damage when it starts its turn in sunlight. While in sunlight, it has disadvantage on attack rolls and ability checks.

Turn Immunity. The nightcrawler is immune to effects that turn undead.

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

Bite. Melee Weapon Attack:+16 to hit, reach 10 ft., one target. Hit: 34 (4d12 + 8) piercing damage. If the target is a Large or smaller creature, it must succeed on a DC 22 Dexterity saving throw or be swallowed by the nightcrawler. A swallowed creature is blinded and restrained, it has total cover against attacks and other effects outside the nightcrawler, and it takes 21 (6d6) cold damage at the start of each of the nightcrawler’s turns. If the nightcrawler takes 40 damage or more on a single turn from a creature inside it, the nightcrawler must succeed on a DC 25 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 Pincers. Melee Weapon Attack: +16 to hit, reach 15 ft., one target. Hit: 30 (4d10 + 8) slashing damage plus 35 (10d6) poison damage. The target is grappled (escape DC 24) if it is a Large or smaller creature and the Nightcrawler doesn’t have another creature grappled.

Haste (Recharge 6). As a bonus action at the start of its turn, the nightwave can gain the benefits of a haste spell (no concentration required), which lasts until the start of its next turn. However, the extra action can only be used to take the dash, disengage, or hide action.

Cold Breath (Recharge 5-6). The nightcrawler exhales a 60-foot cone of frigid air. Each creature in that area must make a DC 22 Constitution saving throw, taking 81 (18d8) cold damage on a failed save, or half as much damage on a successful one.

Call Shadows (1/Day, Requires Night-Time). The nightcrawler conjures forth 2d4 + 1 shadows which appear in empty spaces within 60 feet of the nightcrawler. The shadows act on their own initiative and obey the nightcrawler’s telepathic commands.

The 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. The nightcrawler regains spent legendary actions at the start of its turn.

Cast Innate At-Will Spell (Costs 2 Actions). The malaugrym casts an innate spell it can cast at will.

Move (Costs 2 Actions). The nightcrawler moves up to half its movement speed.

Pincer Attack. The nightcrawler makes a pincer attack.