Upper Seal is a rare drop item in Sailor Piece used for spawning the Moon Slayer boss. This item drops from any NPC in the game, but the drop rate is low enough that you need to farm consistently. Getting Upper Seals requires grinding strong enemies on high-level islands. Here's how to get Upper Seal in Sailor Piece and what to use it for.

How to Get Upper Seal in Sailor Piece?

Upper Seal drops from defeating any NPC in Sailor Piece. You can get it from enemies on any island, from Star Island all the way to Lawless Island. However, not all farming spots are equally efficient.

Best Farming Locations

Lawless Island is the top farming spot for Upper Seals. This island has level 12,000 NPCs, the strongest regular enemies in the game. Higher level enemies give better drop rates for rare items like Upper Seals. Farm Arena Fighters and other mobs on Lawless Island for the best chances.

Shinjuku Island also works well for Upper Seal farming. The NPCs here are strong enough to have decent drop rates. Shinjuku is especially good if you use specific farming methods that clear multiple enemies at once. Don't waste time farming weak mobs on low-level islands. The drop rate on weak enemies is terrible compared to late-game NPCs. Go straight to Lawless Island or Shinjuku if you want Upper Seals efficiently.

  • Our Recommendation: Travel to Lawless Island and find the Atomic boss spawn area. Set the boss to auto-spawn so it respawns automatically after you kill it. Use Gilgamesh fighting style and stand near the boss spawn. Turn on auto ability in the settings if your build can handle it. This lets you kill the boss repeatedly while also farming nearby NPCs at the same time.

How to Use Upper Seal in Sailor Piece?

Upper Seals are used to spawn the Moon Slayer boss on Boss Island. Travel to Boss Island and find the Moon Slayer boss summoner NPC. Talk to the NPC to see boss spawn options. You can spawn the boss on different difficulties:

Normal Difficulty

  • 1 Upper Seal
  • 700,000 Money
  • 700 Gems

Extreme Difficulty

  • 4 Upper Seals
  • 1,750,000 Money
  • 1,750 Gems

Higher difficulties make the boss stronger but increase drop rates for rare materials. If you can handle Extreme difficulty, it's worth using 4 Upper Seals instead of 1.

Moon Slayer Fighting Style Unlock

Upper Seals are also required to unlock the Moon Slayer fighting style. You need a total of 25 Upper Seals plus other materials:

  • 25 Upper Seals
  • 1 Moon Crest
  • 4 Crescent Shards
  • 9 Lunar Essence
  • 16 Demon Remnants
  • 37,500 Gems
  • "Six Eyed Demon" Title

The fighting style unlock requires significantly more Upper Seals than just spawning the boss once. If you want the fighting style, prepare to farm hundreds of NPCs on Lawless Island or Shinjuku. For more Sailor Piece guides and boss materials, check out our Sailor Piece Wiki.