- Players can acquire Crystal Keys by defeating Sea 2 NPCs in Sailor Piece.
- Use the Crystal Keys to spawn the Crystal Defense portal on Punch Island.
- Players can farm Crystal Keys quickly by using C attack of Quake fruit on Sea 2 Starter Island NPCs with a balanced luck build.
Crystal Keys are one the most important items as they give exclusive entry to the Crystal Defense game mode. Since this mode rewards players with powerful swords, unique outfits, and rare titles, mastering the grind for keys is essential. Follow our guide below to learn the best ways to farm Crystal Keys in Sailor Piece.
How to Obtain Crystal Key in Sailor Piece
You can only get Crystal Key in Sailor Piece by defeating NPCs in Sea 2. So, once you get to Sea 2 in Sailor Piece, go over to any of the Islands and start farming the normal NPCs to get the keys. However, given they are legendary items in Sailor Piece, higher level NPCs have better chance of dropping the keys.

Tips and Tricks to Farm Sailor Piece Crystal Keys
While the concept of farming the Crystal Key is simple, it can get hard to grab them fast. To help you out, below we have compiled the best tips and tricks to farm Crystal Keys in Sailor Piece quickly:
- Before you start farming the keys, make sure you use the best luck build in Sailor Piece. NPCs are easier to defeat so you won’t need a lot of damage.
- In case you are getting more mythic and secret drops, then lowering the luck titles and runes in Sailor Piece from the build will help.
- To farm multiple NPCs at once, go to the Starter Island of Sea 2. Once there, use the quake fruit and stand between the NPCs (use image below for reference). Now auto skill the C skill and farm the Crystal Keys quickly.

How to Use Crystal Key in Sailor Piece
Once you have the Crystal Keys, go to the Punch Island and head over to the left end. Now go past the NPCs toward the end and interact with the Crystal Defense NPC and click the Spawn button. This will start the portal to enter Crystal Defense in Sailor Piece. This is where you can obtain the Anti Magic sword.

Crystal Defense works like Infinite Tower in Sailor Piece. So, you can continue the floors as long as the crystal health is intact. If it is destroyed, restarting the defense will require one Crystal Key.
So, that is how you can farm Crystal Key in Sailor Piece fast. Did you start the Crystal Defense in Sailor Piece yet? Share your best floor record in the comments below.
You can use Crystal Keys on Punch Island to spawn the Crystal Defense portal.
Crystal Keys only drop from NPCs in Sea 2, with higher-level enemies having better drop rates. So, make sure you are doing it in the right spot.
