Upper Seals are among the rarest drops in Sailor Piece, introduced alongside the Moon Update as the key resource for accessing the Moon Slayer boss. Every player pushing into endgame content will need a steady stack of them, and the drop rate is low enough that farming without a plan will waste hours. Here's the full breakdown on where to get them, how to speed things up, and exactly what you spend them on.
Where do Upper Seals drop in Sailor Piece?
Upper Seals can drop from almost any enemy across all islands in Sailor Piece. The catch is that the base drop rate is very low, comparable to Passive Shards, and regular early-game mobs will rarely produce results worth your time.
The three locations worth farming are:
- Ninja Island (level 11,500 enemies, consistent mob density)
- Lawless Island (level 12,000 enemies, fast respawns, high drop potential)
- Soul Dominion (strong enemies with above-average drop chances, noted by Indiatimes)
Deltia's Gaming also lists Shinjuku as a viable option alongside the above two. All of these are endgame zones, so if you haven't reached those level brackets yet, the priority should be hitting the progression milestones first before grinding Upper Seals.
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Farming low-level mobs on starter islands is technically possible but practically useless. The drop rate scales with enemy difficulty, so staying in endgame zones is non-negotiable for efficient farming.
How do you farm Upper Seals efficiently?
Because the drop is random and rare, the strategy is purely about volume: kill as many enemies as possible in the shortest time. After testing mob-clearing approaches across these zones, the fastest method is spamming area-of-effect (AOE) moves from Devil Fruit powers to hit multiple enemies per cast rather than picking off single targets.
Key farming principles:
- Prioritize high-damage AOE abilities to clear packs quickly
- Stay in one zone rather than island-hopping; consistent clearing beats constant travel
- Target regular mobs over bosses, since regular enemies respawn faster and you can chain kills continuously
- Boss fights can supplement your grind for their own loot, but they're slower Upper Seal sources due to long health pools and spawn timers
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Put on a long video or podcast before you start. This grind is designed as a time investment, not a quick reward. The players who collect Upper Seals fastest are the ones who commit to one zone and don't break rhythm.
If farming feels too slow, Indiatimes notes that trading with other players is also a valid way to obtain Upper Seals, though supply from other players depends entirely on the server economy at any given time.
How can you increase your Upper Seal drop rate?
The Luck stat directly affects rare item drop chances in Sailor Piece. According to the IGN wiki, there are several ways to push it higher:
The Kitsune Species reroll is the most straightforward single upgrade if you haven't already done it. For Boss Kill Titles, the IGN wiki recommends focusing on defeating world bosses and Boss Island encounters to stack these titles before grinding Upper Seals specifically.
What are Upper Seals used for in Sailor Piece?
All sources agree on two primary uses. The first is summoning the Moon Slayer boss at Boss Island by speaking with the Boss Summoner NPC. The second is unlocking Moon Slayer-related combat abilities.
Here's the exact cost breakdown:
Eurogamer's guide adds that summoning Moon Slayer also requires 700,000 cash and 700 gems on top of the 1 Upper Seal entry cost (note: Eurogamer lists 1 seal for the base summon, while Deltia's Gaming lists 25 for the fighting style unlock, suggesting these cover different tiers of the encounter). The Moon Slayer boss drops Moon Crests, Crescent Shards, Lunar Essence, and Demon Remnant, all of which can be exchanged with the Moon Slayer NPC at the back of Boss Island for the Moon Slayer sword, currently one of the best swords in the game according to Eurogamer.
Higher difficulty versions of the Moon Slayer fight have better loot tables, so keeping a surplus of Upper Seals lets you run harder difficulties and stack materials faster.
Is it worth grinding Upper Seals for the Moon Slayer fighting style?
The Moon Slayer melee spec requires the Six Eyed Demon title (which grants +85% DMG according to Deltia's Gaming) as a prerequisite, and that title comes from defeating the Moon Slayer boss. So yes, the Upper Seal grind feeds directly into one of the strongest damage multipliers currently available. The 85-seal cost for the F Move is a long-term target, but the boss summon threshold of 25 seals is achievable in a focused session at Ninja Island or Lawless Island.
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