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The Ice Core is one of the most sought-after drops from Sailor Piece’s Ice Queen boss, added in the Ice Update on April 8, 2026. Whether you’re crafting the Ice Queen Sword or unlocking its devastating F Move, you’ll need Ice Core, and it isn’t easy to get. Here’s everything you need to know to farm it efficiently and use every copy wisely.
| Detail | Info |
|---|---|
| Source | Ice Queen Boss (Boss Island) |
| Base Drop Rate | 0.5% |
| Pity Drop | Guaranteed Mythical at 25 kills |
| Used For | Ice Queen Sword + F Move |
| Copies Needed (Total) | 3 (1 for sword, 2 for F Move) |
Ice Core is a Mythical-rarity crafting material exclusive to the Ice Queen boss on Boss Island. It has a 0.5% base drop rate, making it the rarest item from this boss, rarer than Frozen Brand (1.5%) and well below Frost Relic (mob drops). The good news: Sailor Piece’s pity system guarantees a Mythical drop after 25 boss kills, which can be Ice Core, Frozen Brand, or the Ice Queen Outfit.
You need 3 Ice Cores total across both progression steps, so plan your farming accordingly from the start.
Ice Core only drops from the Ice Queen boss. Here’s the exact process:
| Difficulty | Boss HP | Notes |
|---|---|---|
| Normal | 1,650,000,000 | More runs per hour if you’re under-geared |
| Hard | Higher | Better drop rates |
| Extreme | Highest | Best drop rates; requires strong build |
Pro tip: If you’re low on Frost Relics, wait on Boss Island for another player to spawn the Ice Queen. You can collect drops from a kill you didn’t pay to summon, free runs count toward pity.
Run Normal difficulty until you can clear Hard in under 2–3 minutes. More kills per hour beats higher per-kill drop rates at lower efficiency.
Ice Core has two uses in the Ice Queen progression chain, and you’ll need both.
To purchase the Ice Queen Sword from the Esdeath NPC on Boss Island, you need:
| Material | Quantity |
|---|---|
| Ice Core | 1 |
| Frozen Brand | 4 |
| Glacier Remnant | 9 |
| Battle Shard | 17 |
| Frost Relic | 25 |
| Frost Empress Title | Required |
| Gems | 40,000 |
The Frost Empress title drops from the Ice Queen boss itself (check our Sailor Piece Bosses Guide for boss strategies). The NPC is located northeast on Boss Island, under the hand statue.
Unlocking the sword’s ultimate F Move requires visiting the Ice Queen F Move Mastery NPC — located on top of the hand statue tree on the right side of Boss Island, alongside other Mastery NPCs.
| Material | Quantity |
|---|---|
| Ice Core | 2 |
| Frozen Brand | 10 |
| Frost Relic | 85 |
| Ice Queen Sword | Must own |
| Frostbane Clan | Required |
The F Move summons a blizzard that deals 100 billion damage over an extended AOE and adds a permanent +30% damage bonus to the sword. Frostbane is a Mythical clan requiring 500 clan rerolls to trigger pity, use Sailor Piece codes to stockpile free rerolls. See the Sailor Piece Ascension Guide for ways to boost your overall power before taking on this grind.
Ice Core has a 0.5% base drop rate from the Ice Queen boss. Higher difficulties improve this, and after 25 kills, you’re guaranteed a Mythical drop (which includes Ice Core as one of the possible items).
You need 3 Ice Cores total — 1 for the Ice Queen Sword and 2 for the F Move Mastery. Plan to farm them together to save time.
No. Ice Core only drops from the Ice Queen boss on Boss Island. Frost Relics drop from regular mobs, but Ice Core is boss-exclusive.
Yes, your pity meter resets once you receive a Mythical-rarity drop. It does not reset on Legendary drops.
Run Normal difficulty rapidly for more boss attempts per hour, boost your Luck stat and clan bonuses, and use the free-kill method by waiting for other players to spawn the boss.
