Diablo 3 farming guides.
Diablo 3 materials farming.
Like the vast majority of items in diablo 3 legendaries and set items can only be found through chance and cannot be target farmed.
That means killing monsters elites and bosses opening chests gambling at kadala and upgrading rare items at the cube.
Staff of herding hellfire amulet hellfire ring etc.
Crafting materials crafting artisans require an array of materials recovered from the wilderness to craft their wares.