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Frost Worm, Advanced

This immense white worm has a single circular eye in the center of its head. Wisps of icy fog waft up from between its mandibles.

Advanced Frost Worm CR 13

XP 25,600
N Huge magical beast (cold)
Init +9; Senses darkvision 60 ft., low-light vision; Perception +19


AC 31, touch 13, flat-footed 26 (+5 Dex, +18 natural, –2 size)
hp 200 (16d10+112)
Fort +17, Ref +15, Will +12
Immune cold
Weaknesses vulnerable to fire


Speed 30 ft., burrow 10 ft.
Melee bite +27 (4d10+18 plus 4d6 cold)
Space 15 ft.; Reach 10 ft.
Special Attacks breath weapon (60-ft. cone, 15d6 cold damage, Reflex DC 25 half, usable once per hour), death throes, trill


Str 35, Dex 20, Con 25, Int 2, Wis 20, Cha 15
Base Atk +16; CMB +30; CMD 45 (can’t be tripped)
Feats Cleave, Combat Reflexes, Improved Initiative, Iron Will, Power Attack, Skill Focus (Perception), Stand Still, Weapon Focus (bite)
Skills Perception +19, Stealth +8 (+16 in ice and snow); Racial Modifiers +8 Stealth in ice and snow
SQ cold


Cold (Su)

A frost worm’s body generates intense cold, allowing it to deal an additional 4d6 cold damage with its bite attack. Any creature that attacks a frost worm with an unarmed strike or a natural weapon takes 1d6 points of cold damage per successful hit. A creature that grapples or is grappled by a frost worm takes 4d6 points of cold damage per round the grapple is maintained.

Death Throes (Su)

When killed, a frost worm explodes in a 100-foot-radius burst that deals 12d6 cold damage and 8d6 piercing damage (DC 25 Reflex half). The save DC is Constitution-based.

Trill (Su)

As a full-round action, a frost worm can emit a strange trilling sound that affects all creatures within a 100-foot radius. Creatures must succeed on a DC 20 Will save or be fascinated for as long as the worm continues to trill (the frost worm can maintain this trill by concentrating). Once a creature has resisted or broken the effect, it cannot be affected again by that same frost worm’s trill for 24 hours. This is a sonic mind-affecting effect. The save DC is Charisma-based.