Toira Fibers

is the fourth of the 5 available fibers in the game. It is used for tailoring and alchemy. Gathering toira fibers can only level the player's Plant Gathering level up to a maximum of 251. The plants have a chance of dropping Essential Mana, Idyllic Leafs Cochineal Beetles, Indigo Petals, Murex Snails, Saffron Stalks, or Purpurin Roots instead of the actual fibers.

Source
Dropped by monsters and plants from the following provinces:
 * Ostgarath
 * Serpentis Isle
 * Westonia