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Now, to actually enter Crystal Defense, you’re gonna need something called a Crystal Key.This key is used to open the portal to the game mode, and yeah, it’s a one-time use, so once you use it, it’s gone. So that means you’re gonna need a lot of Crystal Keys if you want to keep farming this mode. But don’t worry, getting it is actually pretty simple. You just need to kill NPCs across all islands in Sea 2. So yeah, you can just farm normally, and eventually you’ll start getting Crystal Keys while