Frost Worm

AC 27, touch 11, flat-footed 24 (+3 Dex, +16 natural, -2 size)

hp 168 (16d10+80)

Fort +15 Ref +13 Will +10

Immune cold

Weaknesses vulnerable to fire

Speed 30 ft., burrow 10 ft.

Melee bite +25 (4d10+15 plus 4d6 cold)

Space 15 ft. ; Reach 10 ft.

Special Attacks breath weapon (60-ft. cone, 15d6 cold damage, Reflex DC 23 half, usable once per hour), death throes, trill

CMB +28 CMD 41 (can't be tripped)

Str 31, Dex 16, Con 21, Int 2, Wis 16, Cha 11

Base Atk +16

Feats Cleave, Combat Reflexes, Improved Initiative, Iron Will, Power Attack, Skill Focus (Perception), Stand Still, Weapon Focus (bite)

Skills Perception +17, Stealth +6 (+14 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 23 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 18 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.