How to Get Black Reaper in Sailor Piece (2026 Full Guide)

The Black Reaper is the signature melee style added in the Ghoul Update, rated S+ and modeled after the kagune combat style associated with Tokyo Ghoul's Ken Kaneki. It sits at or near the top of Sailor Piece's melee tier list and is one of the longer grinds in the game. Unlocking it requires a rare boss-drop title, a significant Gem investment, a handful of crafting materials that also come from the same boss, and a dedicated mastery questline just to access the full kit. This guide walks through every step in order and explains the most efficient farming sequence so you spend as little time as possible waiting between runs.

1Step 1 — Unlock Isolation Island (Blood Flower Quest)

Isolation Island is the endgame zone added with the Ghoul Update. It does not appear on the Sea 2 map until you complete the Blood Flower Quest. To start it, teleport to Sea 2's Starter Island, find the NPC marked on the main mountain, and accept her quest. She will send you to collect a set of Blood Flowers hidden across the Sea 2 islands. Once you return the final flower, the quest completes automatically and Isolation Island immediately appears in your fast-travel list. The quest has no RNG — it is a straightforward collectible hunt across locations you may already know.

2Step 2 — Farm Reaper Keys (Your Entry Ticket to the Boss)

Reaper Keys are the consumable tokens you use to summon the Black Reaper boss. They drop exclusively from Ghoul Member mobs on Isolation Island. The drop rate is low — community players report averaging one key every several hundred kills — so it pays to farm them in bulk before you start your first boss session. Build up a comfortable stockpile rather than farming one key at a time; stopping mid-session to re-farm keys breaks your rhythm and interrupts both the pity counter progress and Mastery accumulation. Once you have enough keys, take them to the Black Reaper Summoner NPC inside the stone chamber on Isolation Island to spawn the boss.

3Step 3 — Materials You Need (Full Cost Breakdown)

The Black Reaper requires six things: the One-Eyed King title, a large Gem payment, and four stacking crafting materials — Black Shards, Reaper Remnants, Rinkaku Cores, and Ghoul Essences. All four crafting materials drop from the Black Reaper boss itself, so your boss-kill sessions simultaneously farm the title and every material. The Gems you accumulate through general Sea 2 content. Running the boss on higher difficulties raises drop probability across all materials, so once your build can handle Medium or above, you will generally collect the full material set faster than on Easy.

4Material Requirements at a Glance

• One-Eyed King Title — drops from the Black Reaper boss; rate scales with difficulty; the game includes a pity system so the title is eventually guaranteed after a large number of qualifying kills
• Gems — a significant amount earned through general Sea 2 content, quests, and boss bounties (check the in-game shop or current wiki for the exact price, as it may change)
• Black Shards (multiple) — drop from the Black Reaper boss on all difficulties
• Reaper Remnants (multiple) — drop from the Black Reaper boss on all difficulties
• Rinkaku Cores (multiple) — drop from the Black Reaper boss on all difficulties
• Ghoul Essences (multiple) — drop from the Black Reaper boss; rate improves on higher difficulties

5Step 4 — The One-Eyed King Title (and the Pity System)

The One-Eyed King is the rarest single requirement for the Black Reaper unlock. It drops directly from the Black Reaper boss, and the drop rate scales up with difficulty — farming on Medium or higher is consistently faster than Easy. To prevent extreme bad luck the game includes a pity system: after a set number of qualifying boss kills you are guaranteed to receive the title on your next attempt. The exact pity threshold is not officially published, but community tracking suggests it kicks in well before the 200-kill mark. The pity counter is reported to persist across sessions, so logging out does not reset your progress — always confirm this with the current patch notes or the community Discord in case the mechanic changes in a future update.

6Step 5 — Purchasing the Black Reaper (NPC Location)

Once you hold all required materials — the One-Eyed King title equipped, the full Gem amount, and all four crafting material stacks — head to the seller NPC on Isolation Island. The NPC is stationed near the main plaza of the island. The Black Reaper only appears as a purchasable option when you have the One-Eyed King title active; if you do not see it listed, double-check that the title is equipped rather than just owned. Confirm the trade and the Black Reaper melee is immediately added to your inventory.

7Step 6 — Unlocking the F-Move (Mastery Questline)

Owning the Black Reaper gives you its core moveset immediately, but the F-Move — the most powerful ability in its kit — is locked behind a separate mastery questline. Find the Black Reaper Master NPC on Isolation Island and accept the quest. The questline requires you to satisfy several conditions simultaneously: reach a high Mastery level with the Black Reaper equipped in active combat, defeat the Black Reaper boss a required number of times on Medium difficulty or higher, and have the Ghoul bloodline active on your character. None of these conditions can be skipped by purchasing the melee with Robux — the mastery questline is mandatory regardless of how you obtained the weapon. Check the in-game quest tracker or the current wiki for the exact numerical thresholds, as these can be adjusted in balance patches.

8The Ghoul Bloodline — How to Get It

The Ghoul bloodline is a Legendary-rarity bloodline added in the same Ghoul Update. You obtain bloodlines in Sailor Piece by collecting Bloodline Stones from NPCs and bosses across Sea 2, then spending them at the bloodline reroll NPC. The Ghoul bloodline is a rare outcome, so expect to spend multiple stone batches before landing it. Its stat bonuses are well-suited to the F-Move questline conditions — the damage and HP multipliers both speed up boss kills, and having the bloodline active before you purchase the Black Reaper means you can start the F-Move quest immediately upon purchase rather than having to chase the bloodline afterward. Note that Ghoul Essences, which drop from the boss, are a separate crafting material and do not directly grant the bloodline.

9Efficient Grind Plan — Recommended Order of Operations

1. 1

   Complete the Blood Flower Quest

   Collect all Blood Flowers across the Sea 2 islands. This is a one-time unlock with no RNG — you simply need to visit each marked location. Use the community wiki or Discord for current spawn coordinates, as exact positions can change between patches.

2. 2

   Build a solid Reaper Key stockpile before your first boss session

   Farm Ghoul Members in bulk using AoE abilities before you start any boss attempts. Having a large stockpile means you will not need to pause boss-kill streaks to re-farm keys — those interruptions break your pity counter momentum and slow Mastery accumulation.

3. 3

   Run the Black Reaper boss on Medium difficulty or above

   Easy difficulty has lower drop rates across all materials and the One-Eyed King title. Medium and above improve drop rates and also count toward the F-Move quest boss-kill requirement. If your build cannot yet sustain Medium, run Easy until you collect enough gear to step up — do not waste time on a difficulty where you are wiping.

4. 4

   Chase the Ghoul Bloodline in parallel

   While farming Reaper Keys from Ghoul Members you will naturally collect Bloodline Stones. Spend these at the bloodline NPC between boss sessions rather than waiting until after you purchase the Black Reaper. Having the Ghoul bloodline ready before the purchase means you can accept the F-Move quest the moment you own the weapon.

5. 5

   Purchase the Black Reaper once all materials are ready

   Equip the One-Eyed King title, confirm you have the Gem balance and all four crafting material stacks, then trade at the seller NPC on Isolation Island. The melee is added to your inventory instantly.

6. 6

   Activate the F-Move questline with the Black Reaper Master NPC

   Speak to the Black Reaper Master NPC on Isolation Island. Keep the Black Reaper equipped and the Ghoul bloodline active throughout this phase. Any boss kills on Medium or higher that you already completed during the farming phase will carry over toward the quest requirement — check your quest tracker to see how many count.

7. 7

   Grind to the required Mastery level and claim the F-Move

   Use the Black Reaper in all combat — boss runs, Sea 2 NPC farming, and any available events — to hit the required Mastery level as fast as possible. Once all three quest objectives show complete, return to the Black Reaper Master NPC to claim the F-Move unlock. The Black Reaper is now fully operational.

10Boss Reference Table

11Frequently Asked Questions