How to Get Crystal Keys in Sailor Piece?

Crystal Key in Sailor Piece lets you enter the newest game mode called Crystal Defense on Punch Island. It was added with the latest Anti-Magic update on April 27, 2026. Consider it similar to a Tower Key in Sea 1, which is used to access the Infinite Tower on Tower Island. Similar to a Tower Key, a Crystal Key isn’t readily available because of its elusive nature. Hence, you will have to stay sharp and farm it the right way.

How to Farm Crystal Keys in Sailor Piece

The Crystal Key | Image Credits: Radex Tips/YouTube/Shadowrise Devs

In this Roblox game, you can get the Crystal Keys by beating up mobs in Sea 2. Frankly, every mob in the second sea drops this item, so you can go on a killing spree to farm the said key there. A general thing to remember is that the drop rate of the Crystal Key is very low, so you will have to beat countless mobs before obtaining one.

We suggest that you boost your luck using an appropriate Rune or Accessory in this game. With increased luck, you will stand a better chance of obtaining the key. The best you can do is enable the automatic execution of moves in the in-game settings. Once done, you can get close to a group of mobs and go AFK.

If your move has a decent AoE, you can defeat a bunch of mobs at once. Moreover, since you have enabled automatic execution of moves, you can go AFK and let your character deal with them. This will ensure you are farming Crystal Keys even while being away from the game.

How to Use Crystal Keys in Sailor Piece

For those who have already obtained a Crystal Key and want to use it, you must head over to the Punch Island in Sea 2 to do that. On this island, you will find an NPC called Crystal Defense. You can interact with this NPC and use a key to enter the Crystal Defense game mode. In this game mode, you will have to defend a crystal from waves of incoming enemies. Based on your performance in this mode, you will earn an exclusive currency called Crystal Coins.

Crystal Coins can be used to buy upgrades from the Defense Upgrades NPC on Punch Island. You can upgrade your damage output, critical damage, critical chance, HP, and Luck from this NPC. Apart from that, Crystal Coins can also be spent at the Defense Merchant to buy various items, including the newest Anti-Magic sword in Sailor Piece.

What other item do you want to unlock next in Sea 2? Let us know in the comments below.