Sources
CR
Type
Size
Alignment
Movement

Polar Serpent

Large Elemental, Neutral

Armor Class 14
Hit Points 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
Damage Vulnerabilities fire
Damage Immunities cold
Senses Darkvision 60 ft., passive Perception 13
Languages understands Primordial but can't speak
Challenge 3 (700 XP)

Traits

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.

Lore

Ephemeral, Heat-Draining Elemental