Published: April 12, 2026 
The Babylon Key is a crafting item in Sailor Piece required to unlock Gilgamesh's F move, one of the strongest abilities in the game. Getting this key requires farming specific materials and defeating the Gilgamesh boss multiple times. This guide covers where to craft the Babylon Key and how to gather all the required materials efficiently.
Materials Needed for the Babylon Key in the Sailor Piece
You need four different items to craft the Babylon Key. The materials include both common drops and rare boss materials, so expect to spend time farming.
| Material | Amount |
|---|---|
| Broken Swords | 100 |
| Golden Essence | 5 |
| Phantasm Cores | 2 |
| Servant Race | Must be equipped |
Broken Swords are the easiest material to collect. Farm any sword-wielding enemies across the map until you reach 100 swords. This takes time due to the high quantity needed, but the drop rate is decent from regular enemies.
Golden Essence and Phantasm Cores both come from the Gilgamesh boss. You'll need to defeat this boss multiple times to collect enough materials. Each boss kill has a chance to drop these items, so the exact number of runs varies based on your luck.
The Servant race requirement is crucial. You must have this race equipped when talking to the Babylon Key Crafter NPC. If you're using a different race, the NPC will refuse to craft the key even if you have all the materials. Use Race Reroll items to get the Servant race if you don't have it yet.
How to Craft the Babylon Key
Once you have all materials and the Servant race equipped, return to Boss Island. Find the Babylon Key Crafter NPC on the island. This is a different NPC from the Boss Summoner you talked to earlier. Talk to the Babylon Key Crafter NPC with the Servant race active. If you're using the wrong race, the NPC won't offer the crafting option. Double-check your race before interacting.
Select the crafting option when it appears. The NPC takes all your materials (100 Broken Swords, 5 Golden Essence, 2 Phantasm Cores) and creates the Babylon Key. The key goes directly into your inventory. Use the Babylon Key to unlock Gilgamesh's F move. This powerful ability makes the entire farming process worthwhile and significantly upgrades your combat effectiveness. For more Sailor Piece guides check out our Sailor Piece wiki.
