Worm That Walks

Medium swarm of Tiny beasts, chaotic evil

Armor Class 14
Hit Points 137 (25d8 + 25)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
6 (-2)	18 (+4)	13 (+1)	20 (+5)	15 (+2)	16 (+3)

Saving Throws Intelligence +10, Wisdom +7
Skills Arcana +10, Athletics +3, History +10, Nature +10
Damage Resistances bludgeoning, piercing, slashing
Damage Immunities poison
Condition Immunities paralyzed, petrified, poisoned, restrained, stunned
Senses blindsight 30 ft., darkvision 60 ft., passive Perception 12
Languages Abyssal, Aklo, Common, Infernal
Challenge 14 (11,500 XP)

Special Traits

• Regeneration. The worm that walks regains 10 hit points at the start of its turn, as long as it does not begin its turn in an area of strong wind. The worm that walks is destroyed only if it starts its turn with 0 hit points and doesn’t regenerate.
• Spellcasting. The worm that walks is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 18, +10 to hit with spell attacks). The worm that walks has the following wizard spells prepared.
  • Cantrips (at will): acid splash, mage hand, poison spray, prestidigitation
  • 1st level (4 slots): mage armor, magic missile, shield
  • 2nd level (3 slots): acid arrow, misty step, web
  • 3rd level (3 slots): fireball, stinking cloud
  • 4th level (3 slots): black tentacles, blight
  • 5th level (2 slots): cloudkill, conjure elemental

Actions

• Discorporate. The worm that walks collapses into a shapeless swarm of worms, or reverts to its true form. All held, worn, and carried items fall to the ground. In this form, the worm that walks is Large-sized, can fit through any space large enough for a Tiny creature to pass through without squeezing, and can occupy the same space as another creature and vice versa. While in this form, the worm that walks cannot use its Slam attack. Any creature who enters the same space as the discorporated worm that walks, or starts its turn in the same space, must make a DC 18 Constitution saving throw. On a failed saving throw, that creature takes 36 (8d8) poison damage and 36 (8d8) necrotic damage. If the worm that walks drops to 0 hit points, it immediately gains 24 temporary hit points and uses this ability as a reaction. Until it regains at least 1 hit point, it cannot revert to its normal form.
• Slam. Melee Weapon Attack: +9 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 4) bludgeoning damage, and the target is grappled (escape DC 18). The worm that walks can only grapple one target at a time, and must remain within 5 feet of the grappled target. If the worm that walks moves more than 5 feet from the grappled creature, the grappled ends. At the beginning of each of the worm that walks’ turns, the grappled creature takes 18 (4d8) poison damage and 18 (4d8) necrotic damage.