You can find the Exchange Shop when you open Shop on the main game screen:
The Exchange Shop becomes available only after you fully upgrade at least one feature that uses one of the following resources:
- Skin Stones;
- Rune Stones;
- Chaos Cores;
- Mastery Crystal;
- Titan Potions;
- Titan Skin Stones;
- Fairy Dust.
For example, if all your titans have reached the maximum level and you can no longer use Titan Potions to upgrade them, the Exchange Shop will unlock. Once unlocked, it remains available even if new titans are released.
You can also use these resources in the Exchange Shop to purchase Energy, Meta Cubes, Golden Horns of Summoning, and Booster Tokens. Additionally, spending them in the Exchange Shop counts toward quest progress. This way, you can complete quests that require spending these resources even after you have fully upgraded the features that use them.
All goods are updated every 24 hours at 9:00 PM your in-game time. You can also refresh the Exchange Shop using emeralds.