In one sentence, describe what the following article is about:

You have a large chance of getting good items like spikes and betas. Some passages will get you store items, while others can get you better items. Try to play adventures with the animal that the passage is.

Summary:
Go to Adventure Base Camp and either play or host Return of the Phantoms Hard Mode. When you get to the chests, click the bottom or top right one (as they contain Rares). Do The Forgotten Desert and see how many shards you can find! Passages in all adventures will get you items.