What to know
- You must first obtain the Shadow Sword before unlocking the F move.
- The Shadow Mastery NPC on Starter Island gives six mastery quests.
- Each quest has specific requirements including damage, NPC kills, boss fights, and CID dungeons.
- Completing all quests unlocks the Shadow Sword F Move and grants a 30% damage buff.
Unlocking the Shadow Sword F Move in Sailor Piece Roblox requires completing a mastery questline tied directly to the Shadow Sword. After obtaining the weapon, players must visit the Shadow Mastery NPC located on Starter Island, who provides a set of six progression challenges. Each quest focuses on a different type of gameplay activity such as dealing large amounts of damage, defeating enemies, farming bosses, and clearing dungeons.
Once all six quests are completed, the Shadow Sword gains access to its final ability while also granting a powerful 30% damage buff, making it significantly stronger for combat and farming.
Quick overview of the Shadow Sword F move unlock
| Feature | Details |
|---|---|
| Game | Sailor Piece (Roblox) |
| Required Weapon | Shadow Sword |
| NPC | Shadow Mastery NPC |
| NPC Location | Starter Island |
| Total Quests | 6 mastery quests |
| Activities | Damage farming, NPC kills, boss fights, CID dungeons |
| Final Reward | Shadow Sword F Move |
| Bonus Reward | 30% Damage Buff |
Locations involved while completing the mastery quests
Several areas across the game are important for completing the mastery challenges. Starter Island is where the Shadow Mastery NPC is located and where players can farm large numbers of weak NPCs for the kill requirement. For dealing high damage quickly, Soul Society Island is recommended because the enemies there have more health and allow players to accumulate damage faster.

Boss farming is usually done on Boss Island, where bosses can be spawned instantly using boss keys. Meanwhile, Dungeon Island is where players must complete multiple CID dungeon runs across Easy, Medium, and Hard difficulty levels.
How to unlock the Shadow Sword F move in Sailor Piece
Step 1
Obtain the Shadow Sword first. The mastery quests are locked until the weapon is acquired, so players must already have the Shadow Sword in their inventory before they can start the progression.

Step 2
Once you have the weapon, travel to Starter Island and speak with the Shadow Mastery NPC. Interacting with this NPC will start the Shadow Sword mastery challenge.

Step 3
After speaking with the NPC, you will receive six quests that must all be completed before the F move unlocks. Each quest has a clear requirement that tracks your progress as you play.
Step 4 – Quest 1 requirement

The first quest requires you to deal a total of 1,000,000,000 1 Billion damage.
This damage can be accumulated by fighting enemies and bosses across the game. One of the fastest ways to progress this quest is by defeating high-level NPCs or bosses on Soul Society Island, since stronger enemies allow you to deal more damage quickly.

Step 5 – Quest 2 requirement
The second quest requires you to defeat 1,250 NPC enemies.

This task becomes easier when farming weaker enemies because they respawn quickly. Starter Island is the most efficient location for this quest since the NPCs there are easy to defeat and spawn frequently, allowing you to progress quickly.
Step 6 – Quest 3 requirement
The third quest requires you to defeat 150 bosses.

To complete this requirement efficiently, players should travel to Boss Island and use boss keys to spawn bosses instantly. Many players farm the easiest boss such as Saber, since it can be defeated quickly while still counting toward the quest requirement.

Step 7 – Quest 4 requirement
The fourth quest requires you to complete 10 CID dungeon runs on Easy Mode.
These dungeons can be accessed on Dungeon Island by entering the CID Boss Dungeon. Easy mode runs are generally fast and serve as the starting stage of the dungeon challenge.

Step 8 – Quest 5 requirement
The fifth quest increases the difficulty and requires players to complete 10 CID dungeon runs on Medium Mode.

Medium difficulty features stronger enemies and bosses compared to Easy mode. Players may need better gear or stronger abilities to clear these dungeons consistently.
Step 9 – Quest 6 requirement
The final quest requires players to complete 10 CID dungeon runs on Hard Mode.

This is the toughest part of the mastery challenge because enemies deal significantly more damage and take longer to defeat. Using powerful builds or teaming up with other players can help clear these dungeons more efficiently.
Step 10
After completing all six quests, return to the Shadow Mastery NPC on Starter Island. The NPC will confirm that all mastery challenges have been completed.

At this point, the Shadow Sword F Move will unlock automatically, giving the weapon its final ability. In addition to unlocking the skill, you will also receive a permanent 30% damage buff, significantly improving the weapon’s effectiveness for boss fights, dungeon runs, and general combat.
Rewards from completing the Shadow Sword mastery
| Reward | Description |
|---|---|
| Shadow Sword F Move | Unlocks the final ability of the Shadow Sword |
| 30% Damage Buff | Permanent damage increase after completing all quests |
Unlocking the Shadow Sword F move in Sailor Piece requires completing a set of six mastery quests that test multiple aspects of gameplay, including damage farming, NPC grinding, boss fights, and dungeon clearing. While the process requires time and consistent farming, the reward is extremely valuable. Once unlocked, the Shadow Sword gains its powerful F ability along with a 30% damage buff, making it one of the stronger sword upgrades for players progressing through the game.