Flaywind
Eldritch Storm
Supernaturally powerful winds—like those from planes such as Pandemonium or Minethys, the third layer of Carceri—can spawn flaywinds. A flaywind is an intense sandstorm, gathering large rocks and other debris in addition to sand or grit. The area within the storm is heavily obscured, and a creature exposed to the storm takes 1d4 slashing damage at the start of each of its turns. Only substantial cover or shelter offers protection against the flensing grit.
A flaywind leaves 4d6 feet of sand or debris in its wake. A successful DC 15 Intelligence (Arcana) or (Nature) check or Wisdom (Survival) check allows a character to recognize a flaywind 1 minute before it strikes, allowing time to seek shelter. A flaywind typically lasts 1d4 × 10 hours.
Source: Tasha’s Cauldron of Everything p. 163