By joining adventures, you now have a chance to obtain unique collectibles! Gather all the items in your collection and receive useful resources as a reward!

You can access collections by tapping on the "backpack" icon at your home location.
 
 
There, you can check your progress in assembling the collections. Each collection contains 5 different items.
 
 
Note: collectibles are not shown under the Inventory tab, only under the Collections tab.

Be careful not to get collections and treasures confused, as treasures are only available in certain locations! You can find out more about the treasures under the link.