Chaos Wurm

Large aberration, chaotic neutral

Armor Class 19 (natural armor)
Hit Points 310 (27d10 + 162)
Speed 40 ft., fly 40 ft., swim 40 ft.

STR	DEX	CON	INT	WIS	CHA
28 (+9)	12 (+1)	23 (+6)	20 (+5)	24 (+7)	23 (+6)

Saving Throws Dexterity +7, Constitution +12, Wisdom +13
Skills Acrobatics +7, Deception +12, Intimidation +12, Perception +13, Persuasion +12
Damage Resistances lightning, thunder; bludgeoning, piercing, and slashing from nonmagical weapons
Damage Immunities acid
Condition Immunities exhaustion, frightened, paralyzed, petrified, restrained
Senses darkvision 120 ft. passive Perception 23
Languages all, telepathy 120 ft.
Challenge 18 (20,000 XP)

Special Traits

• Immutable Form. The chaos wurm is immune to any spell or effect that would alter its form.
• Innate Spellcasting. The chaos wurm’s spellcasting ability is Charisma (spell save DC 20, +12 to hit with spell attacks). The chaos wurm can innately cast the following spell, requiring no material components:
• At will: detect evil and good, dispel magic, tongues, vicious mockery
• 3/day each: confusion, mirage arcane
• 1/day each: prismatic spray, weird
• Magic Resistance. The chaos wurm has advantage on saving throws against spells and other magical effects.
• Magic Weapons. The chaos wurm’s weapon attacks are magical.

Actions

• Multiattack. The chaos wurm makes four attacks: one with its bite, two with its claws, and one with its tail.
• Bite. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 23 (4d6 + 9) piercing damage.
• Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 18 (2d8 + 9) slashing damage.
• Tail. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 25 (3d10 + 9) bludgeoning damage.
• Swirling Chaos (Recharge 5-6). The chaos wurm unleashes a wave of swirling chaos in a 60-foot cone that tears at reality, causing its victims blinding pain. Each creature in that area takes 45 (10d8) psychic damage, or half damage with a successful DC 18 Wisdom saving throw. Targets that fail this saving throw must also succeed on a DC 14 Constitution saving throw or be blinded for 1d4 rounds.
• Teleport. The chaos wurm magically teleports, along with any equipment it is wearing or carrying, up to 120 feet to an unoccupied space it can see.