Orbs of Fusing are primarily used to modify the linked sockets on an item. If an item has some quality, each 1% quality improves the result by 1%. While the chance of obtaining three or four linked sockets is relatively high, the chance of obtaining five or six linked sockets is very low, and on average requires hundreds or even thousands of attempts.

Orbs of Fusing may be obtained from vendors. Yeena sells an Orb of Fusing in exchange for 4 Jeweller's Orbs. Orbs of Fusing are uncommon currency items that can be dropped by slain monsters, chests, and destructible containers. They also drop from Arcanist's Strongboxes.