Essence of Wind

is the second of the 5 available essences in the game. It is used for focuscrafting and alchemy. Harnessing essences of wind can only level the player's Energy Harnessing level up to a maximum of 151. The crystals have a chance of dropping Essential Mana instead of the essence.

Source
Dropped by monsters and crystals from the following provinces:
 * Arcadia
 * Celestial Hills
 * Omphalos Plains
 * Popolion
 * Vale of the Fang