Chasground

The chasground is a large mushroom that once grew on the surface, but nowadays it is only found underground. Some drow communities cultivate it, even if the chasground is fragile because it does not resist to excess or lack of water. If it has been well cultivated, it is a highly prized anti-poison.
A decoction of chasground gives advantage on saving throws against Contact or Injury type poisons for the next hour. The chasground is on the other hand inoperative if the poison is already in the organism.