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
Speed 30 ft., burrow 10 ft.
Str 31, Dex 16, Con 21, Int 2, Wis 16, Cha 11
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.
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.