Artifacts come in four rarities, Common, Rare, Magical, and Sagas. There is a total of 16 different items per rarity. Artifacts can be obtained through killing mobs in the Badlands, opening crates, envoys, and Conquests. To access the Tinkerer, his entrance is to the right of spawn – underground.
Some Artifact enchantments aren’t obtainable through vanilla methods and, thus, can’t be repaired. However, they can be repaired in the Tinkerer repair GUI. (anvil) They require an item called a Restoration Scroll, which spawns in Envoys and Conquests in the Bad Lands. These items are single-use and will be consumed.
The lower three Artifact rarities can be traded in for crafting dust at the Tinkerer (Common, Rare, Magical - dust), this then can be used in a unique crafting recipe to upgrade an item. These items can be crafted using the crafting GUI. (crafting bench)
Common Dust > Rare Dust > Magical Dust > Restoration Scroll