Griffon Farming is done in the desert, starting from Augury Rock. Basically,
either a W/Mo or a Mo/W goes from Augury Rock outside to the Prophet’s Path,
and keeps going west to encounter the Desert Griffons. These characters will
then kill the Griffons, harvest their drops, then warp back to Augury Rock
and repeat the process. After obtaining enough items, the farmers will then
sell off their loot and earn money fast.

Augury Rock can be found in the Crystal Desert, which is a long ways into the
game.

Desert Griffons are said to have good drops, ranging from Gold to Purple to
anything else in-between. This is why Griffon Farming is so popular.

EXAMPLE: I make 15k an hour by Griffon Farming.