Items in the game never disappear on their own: every single in-game action is processed and validated by the game servers. If a piece of equipment is missing, there are three possible scenarios:
- You might have equipped this item with another hero. Items are not unique and can be used for various heroes.
- You might have sold this item for gold or exchanged it for activity points for your Guild.
- Crafting in the game is a complex, multi-level system. All higher-tier items are crafted out of lower-tier gear.