Attuned

You can Attune an item at a Stone of Change

Any equippable item (except quivers) can be placed into a Stone of Change with a number of Khyber Dragonshard Fragments to bind the item to the user (character, not account) and prepare it for the later addition of Eldritch Rituals. Binding and attuning an item requires (minimum level of item ^ 2) Khyber Dragonshard Fragments, so a minimum level 12 item would require 144 fragments. An item that is bound no longer takes permanent item damage when repaired, but permanent damage sustained up to that point cannot be repaired and the item can no longer be traded.

Note that there is a bug for items without a minimum level (i.e. minimum level 1) which makes them require 400 fragments instead of 1.