The most beloved and valuable of Griswold's tools, with it you greatly improve the item by turning it into Ethereal or opening a socket! Check the Horadric Cube for more details.

Ethereal items have added to their base +50% Damage in case of weapons, and +50% Defense in case of armor, remember, it's added to the base, so all other bonuses of the item apply to this base value!

Caution! Ethereal items cannot be repaired!