Artifacts

Artifacts can boost items differently, depending on the type of the item you insert them into, so when you look at an artifact it will display 3 different boosts:

[O] - Offensive. If placed on a weapon. (there are some noted exceptions). [B] - Balanced. If placed on a shield or body armor. [D] - Defensive. If placed on a helmet, legpiece, boot or amulet.

An item cannot hold more than three of the same artifact.