Tower Key is a required item for entering Infinite Tower mode in Sailor Piece. Without a Tower Key, you cannot access the tower or farm any of its exclusive items like Primordial Rune, Radiant Rune, or Tower Tokens. The key drops from defeating enemies, but the drop rate is low enough that you'll need to farm consistently. Here's where to get Tower Keys in Sailor Piece and how to use them.

How to Get Tower Key?

Tower Keys drop from defeating any mob in Sailor Piece. You're not limited to specific enemies or locations - any regular NPC you fight has a chance to drop the key. However, some islands/locations work better than others for efficient farming.

Lawless Island is the most effective spot for farming Tower Keys. Head to this island and look for Arena Fighter NPCs. These enemies spawn regularly and can be farmed repeatedly without downtime. Stand near Arena Fighter spawn points and keep defeating them over and over. The Tower Key drop chance is low, so don't expect to get keys after just a few kills. Patience is essential since you might defeat dozens of enemies before seeing a single key drop.

Use a strong style with serious damage output to kill Arena Fighters faster. The quicker you eliminate each enemy, the more enemies you can defeat per hour. More kills mean more chances for Tower Key drops. Farm multiple Tower Keys before entering the tower. Don't stop at one key - collect at least 5-10 keys so you can run Infinite Tower repeatedly without stopping to farm more keys between runs. Having a stack ready saves time and lets you focus on tower progression instead of constantly returning to farm more keys.

How to Use Tower Key in Sailor Piece?

Tower Keys are consumed when entering Infinite Tower mode. Each run costs one Tower Key, so you'll use keys quickly if you're farming the tower seriously. Travel to Tower Island and look for the Infinite Tower entrance. Interact with the entrance and the game will ask if you want to use a Tower Key to start a run. Confirm to consume one key from your inventory and begin the tower challenge.

Once inside, fight through as many floors as possible before dying. The farther you go, the better rewards you earn including Tower Tokens and chances at exclusive runes. Your run ends when you die or choose to leave, and you'll need another Tower Key to enter again. For more Sailor Piece guides check out our Sailor Piece wiki.