Glass Swarm

Ecology
A Glass Swarm consists of thousands of tiny, razor-sharp shards of crystal animated by the anomalous winds of the Shattered Plains or the Sea of Glass. They camouflage perfectly against crystalline surfaces and are often mistaken for simple sand-devils until it is too late.
Combat Mechanics
The swarm deals slashing damage and is resistant to non-magical physical attacks. They can "Blind" targets by catching the sun and reflecting an intense beam of radiant light into their eyes. They are particularly dangerous in high-wind environments, where their speed and damage are doubled. They are vulnerable to thunder damage, which can shatter the individual shards into harmless dust.
Loot
The remains of a swarm can be processed into "Glass-Silk Thread," a rare material used for weaving high-stealth cloaks that grant the wearer advantage on Stealth checks in desert or crystalline environments.