Shimmer Snake

Large beast, chaotic neutral

Armor Class 15 (natural armor)
Hit Points 67 (9d10 + 18)
Speed 20 ft., burrow 30 ft., climb 20 ft., swim 20 ft.

Str	Dex	Con	Int	Wis	Cha
17 (+3)	19 (+4)	15 (+2)	6 (-2)	10 (+0)	15 (+2)

Skills Perception +2
Damage Immunities cold, fire
Senses darkvision 60 ft., tremorsense 20 ft., passive Perception 12
Languages –
Challenge 4 (1,100 XP)

Special Traits

• Heated Body. A creature that touches the shimmer snake or hits it with a melee attack while within 5 feet of it takes 3 (1d6) fire damage.

Actions

• Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target(s). Hit: 7 (1d8 + 4) piercing damage and 3 (1d6) fire damage. If the target is a Medium or smaller creature, it must succeed on a DC 14 Dexterity saving throw or be swallowed by the snake. A swallowed creature is blinded and restrained, it has total cover from attacks and other effects outside the snake, and it takes 3 (1d6) fire damage at the start of each of its turns. If the snake takes 20 damage or more on a single turn from a creature inside it, the snake must succeed on a DC 17 Constitution saving throw at the end of that turn or regurgitate any swallowed creatures, which fall prone in a space within 5 feet of the snake. If the snake dies, a swallowed creature is no longer restrained by it and can escape from the corpse by using 20 feet of movement, exiting prone.
• Surface Strike (Recharge 5-6). A burrowing shimmer snake, no deeper than 5 feet from the surface, can superheat the ice around it, forcing scalding water to erupt upward from the surface in a 5-foot column. Any creature within the column must make a DC 14 Constitution saving throw, taking 9 (2d8) fire damage on a failed save, or half as much damage on a success. Each creature within 5 feet of the column must succeed on a DC 14 Dexterity saving throw or take 2 (1d4) fire damage.

About

A thick-bodied snake, the shimmer serpent is covered in lush fur from the tip of its tail to the base of its head. Two pairs of vestigial legs adorn its length, which is easily twice the height of any human.

The shimmer snake gets its name from the pleasant yellow-green glow it creates while burrowing beneath the icy surface. Such displays have lured many a lost traveler seeking the safety of a campfire into a nest of shimmer snakes (and ultimately their bellies).