Helworm

Known for burrowing underground to snatch their prey by surprise, Hellworms are often sent by higher demons to trap a battlefield long before the battle takes place. Their bite is known to be able to sever limbs.

Hellworm CR: 4

Medium aberration, fiend, chaotic evil

Armor Class: 14

Hit Points: 116

Speed: 10 ft , burrow: 40 ft

STR

12 +1

DEX

10 +0

CON

15 +2

INT

10 +0

WIS

13 +1

CHA

4 -3

Damage Vulnerabilities: Thunder

Condition Immunities: Blinded

Senses: Tremorsense 120ft

Languages: None

Challenge Rating: 4

Actions

Burrow

This creature can burrow underground as a bonus action.
Bite (+1 to hit) This creature bites an opposing creature, dealing 1d6+1 piercing damage.

Boiling Spit

This creature can use this action to vomit a circular pool of boiling mucus either in front of it or behind it. The pool is 15 feet wide. Any creature that steps in this pool must make a DC 16 Constitution saving throw in order to recieve 1/4th damage. On a failed save, the creature takes 2d6 fire damage.

Reactions

Surprise Snare

When burrowed underground with a creature directly above it, this creature must use this reaction (+1 to hit) to ensnare the creature, dealing 2d6+1 piercing damage. After this attack hits, this creature and the one it's snaring roll competing strength checks. If this creature wins, the opposing creature is grappled. If a creature tries to break out and fails, they take an aditional 2d6+1 piercing damage.