If you spend enough time in the game, you may find small objects on the map: caches. Tap/click on them to open a window with a reward that can be obtained before the cache disappears.
You can open a cache:
- with special keys that you should collect,
- by paying with rubies or coins.
You can find cache keys:
- in certain locations,
- in mini-games,
- by fighting monsters,
- by completing an anomaly level or by banishing an anomaly.
Caches may contain:
- weapons and items for summoning monsters,
- special collection items and rare assemblers.