Adventure chests are chests that can be opened to obtain currency. It is also the only way to obtain currency without being tied to time.
SC and NC can be obtained together by opening the Adventure Chest. It may contain a large amount of currency in extremely rare cases.
They are generated only in the nether, The amount of generation increases as the X and Y coordinates approach 0. Chests are regenerated, so there is no need to worry about finishing the collection.