Polar Serpent

Large Elemental, Neutral

AC: 14

Initiative: +4 (14)

HP: 58 (9d10 + 9)

Speed: 40 ft., fly 40 ft.

STR
18 (+4)
DEX
19 (+4)
CON
12 (+1)
INT
4 (-3)
WIS
12 (+1)
CHA
6 (-2)

Skills: Perception +3, Stealth +6

Vulnerabilities: fire

Immunities: cold

Senses: Darkvision 60 ft., Passive Perception 13

Languages: understands Primordial but can't speak

CR: 3 (XP 700; PB +2)

Habitat: Arctic, Underdark

Misty Slithering.

The serpent can move through a space as narrow as 1 inch without expending extra movement to do so.

Actions

Multiattack.

The serpent makes one Bite attack and uses Constrict.

Bite.

Melee Attack Roll: +6, reach 5 ft. Hit: 8 (1d8 + 4) Piercing damage plus 3 (1d6) Cold damage.

Constrict.

Strength Saving Throw: DC 14, one Medium or smaller creature the snake can see within 10 feet. Failure: 3 (1d6) Bludgeoning damage plus 7 (2d6) Cold damage. The target has the Grappled condition (escape DC 14), and it has the Restrained condition until the grapple ends.

Find this creature in the encounter builder

Polar Serpent

Source: The Lost Library of Lethchauntos, p. 269 - Licenses and attribution