Glass-Worm

Ecology
The Glass-Worm is a huge, segmented predator that "swims" through the solid glass dunes of the Shattered Plains. Its body is composed of reinforced, flexible crystal, and its saliva contains an alchemical compound that can flash-freeze sand into solid glass in seconds. It is a solitary hunter, claiming vast territories of the desert.
Combat Mechanics
The worm erupts from beneath the glass dunes, attempting to swallow targets whole. Its crystalline hide reflects light-based spells and grants it resistance to radiant damage. As it moves, it leaves behind a trail of jagged glass shards that act as magical caltrops. If it takes cold damage, its outer shell becomes brittle, reducing its AC for 1 round.
Loot
The worm's stomach often contains "Crystallized Saliva," a potent and rare component for cryomancy and the creation of Frost Brand weapons.