A Focus Core is the suffix upgrade for focus items.
- Focus Cores can be found on any focus with a rarity of blue, purple, or gold. If, after being identified, the focus's name ends with one of the modifiers listed below, then it contains a corresponding Focus Core.
- The Focus Core can be salvaged from the original item using an Expert Salvage Kit or equivalent.
Focus Cores can be found with a variety of modifiers, summarized below. The name of a specific Focus Core will identify its modifier, e.g. Focus Core of Fortitude.
- Focus Cores were introduced in the Nightfall campaign, thus they can only be found on focus items that drop in Nightfall and the Eye of the North expansion.
- Focus Cores can only be applied to inscribable focus items.