Sewant mushrooms

Sewant mushrooms are used to craft the following items:
 * Black blood
 * Enhanced black blood
 * Superior black blood
 * Superior blizzard
 * Enhanced dancing star
 * Superior dancing star
 * Devil's puffball
 * Enhanced devil's puffball
 * Superior devil's puffball
 * Drowner pheromones
 * Gray armor dye
 * Nightwraith decoction
 * Superior tawny owl

Sewants are large grey mushrooms growing in caves (quite possibly every single cave and several crypts in the game).