I see that some items have empty upgrade slots. Are there any crafting professions that can make things to put into these slots? If so which ones?
- The Artificer, Huntsman and Weaponsmith make sigils, which go on weapons.
- The Armorsmith, Leatherworker and Tailor make runes, which go on armor.
- The Jeweler makes Jewels, which along with their basic gemstone components can go in accessories as well as some weapons and armors (depending on the base gem).