The Atomic Sword, also known as Cid V2, is one of the most powerful endgame weapons in Sailor Piece, capable of dealing devastating AoE damage that makes boss raids and dungeons significantly easier. However, getting your hands on it requires serious grinding across multiple islands. This guide covers every requirement, where to farm each item, and how to unlock the full moveset, including the powerful F move.
Where to Unlock the Atomic Sword?
You can unlock the Atomic Sword on Lawless Island, which requires a minimum level of approximately 12,000 for comfortable access and efficient farming. Once you arrive via any Teleport Portal, head to the right corner of the island to find the Atomic Seller NPC standing on the edge. This NPC sells the Atomic Sword in exchange for a specific list of materials.
Alternatively, you can purchase the Atomic Sword directly from the in-game shop for 1,449 Robux if you want to skip the grind entirely.
All Requirements for the Atomic Sword
| Item / Material | Quantity | How to Obtain |
| Eminence Incarnate Title | 1 | Dropped by the Atomic Boss |
| Shadow Sword (Cid V1) | 1 | Purchase from Shadow Trainer NPC at Dungeon Island |
| Gems | 45,000 | Quests, chests, boss drops, or Sailor Piece codes |
| Atomic Omen | 1 | Dropped by the Atomic Boss |
| Eminence Essence | 3 | Dropped by the Atomic Boss |
| Shadow Remnant | 9 | Dropped by the Atomic Boss |
| Magic Shard | 16 | Dropped by the Atomic Boss |
| Abyss Sigil | 80 | Dropped by mobs on Ninja Island and Lawless Island |
Once you gather everything above, return to the Atomic Seller NPC on the right corner of Lawless Island and complete the exchange to receive the Atomic Sword.
Step 1 โ Get the Shadow Sword (Cid V1) First
Before you can unlock the Atomic Sword, you must already own the Shadow Sword (Cid V1). You can obtain it by visiting Dungeon Island and speaking to the Shadow Trainer NPC at the top-left side of the building. The Shadow Sword requires the following materials, most of which drop from the Cid Dungeon on Dungeon Island:
| Requirement | Quantity |
| Shadowborn Race | Required |
| Money | 10,000,000 |
| Gems | 15,000 |
| Atomic Core | 1 |
| Shadow Essence | 4 |
| Void Seed | 8 |
| Umbral Capsule | 20 |
The Shadowborn Race is available to all players but requires a Race Reroll to obtain. You can improve your chances by defeating strong enemies on Lawless Island and Ninja Island, as Epic and Legendary Chests from these encounters carry a high chance of providing Race Rerolls. Additionally, the Atomic Core can sometimes be purchased with dungeon tokens directly if you want to reduce RNG dependency on drops.
Step 2 โ Farm the Atomic Boss
Almost every material needed for the Atomic Sword drops from the Atomic Boss on Lawless Island. To summon it, head to the center of Lawless Island and speak to the Atomic Boss Summoner NPC. You will need Abyss Sigils to initiate each summon, and the cost increases with difficulty:
| Difficulty | Abyss Sigils Required |
| Normal | 1 |
| Medium | 2 |
| Hard | 3 |
| Extreme | 4 |
Higher difficulty levels boost drop rates for rare items significantly, so farming on Hard or Extreme is the most efficient approach once you have enough Sigils. Here are all confirmed drops from the Atomic Boss:
| Drop | Drop Rate |
| Magic Shard | 11.50% |
| Shadow Remnant | 4.01% |
| Atomic Outfit | 1.23% |
| Eminence Essence | 1.02% |
| Atomic Omen | 0.54% |
| Eminence Incarnate Title | Confirmed drop |
Critical Tip: Before starting your Atomic Boss farming sessions, boost your Luck stat as much as possible. You can increase Luck by rerolling to the Kitsune Species (+25% Luck), unlocking Runes, leveling up your Clan, equipping Boss Kill Titles, or purchasing Luck boosts from the Shop. Higher Luck directly improves your chances of landing rare drops like the Atomic Omen, Eminence Essence, and the Eminence Incarnate Title. Additionally, use strong AoE skills and maintain safe positioning when fighting the boss to keep your runs clean and consistent.
Step 3 โ Farm Abyss Sigils
Abyss Sigils drop from the Arena Fighter enemies on Lawless Island and the Ninja enemies on Ninja Island. You need 80 Sigils to purchase the Atomic Sword, plus additional Sigils for every Atomic Boss summon and later for the F move quest. Consistently using AoE attacks to clear these mobs quickly is the most efficient method to build your Sigil count before tackling the boss.
Gems Farming Tips
You need 45,000 Gems as part of the Atomic Sword requirements. Here are all confirmed ways to farm them:
- Complete quests from NPC quest-givers across all islands, as these reward Gems and Chests
- Open Chests earned through quests, as these drop Gems directly
- Defeat mob bosses, as boss kills drop a random number of Gems
- Redeem active Sailor Piece codes, which frequently reward free Gems, clan rerolls, and chests. Check for the latest active codes before spending resources manually
Atomic Sword Full Moveset and Damage Stats
Once you own the Atomic Sword, here is the complete moveset available:
| Keybind | Move Description | Approximate Damage |
| Z | Upward attack, ground smash, then a dashing hard hit | 40 million |
| X | Cyclone of slashes followed by a downward smash | 50 million |
| C | Wide-range cyclone of slashes with a powerful ground-embedding smash | 150 million |
| V | Dark purple field activates, column forms, devastating ground damage | 200 million |
| F | Levitation, dark purple domain, massive AoE damage | 1.7 billion |
Note: These figures represent approximate raw damage output. A well-optimised build using the best races, stats, and traits in Sailor Piece will push these numbers considerably higher.
How to Unlock the Atomic F Move
The F move is the most powerful ability on the Atomic Sword, however it does not unlock automatically. After obtaining the sword, head to the left corner of Lawless Island and speak to the Atomic Master NPC to begin his questline. Completing all three quests below unlocks the F move and grants a permanent damage buff of approximately 30% for the Atomic Sword:
Quest 1: Defeat the Atomic Boss 20 Times on Hard or Extreme Difficulty
This requires roughly 60 Abyss Sigils in total, so build up your Sigil count before starting this quest. Farming on Hard or Extreme also improves your chances of picking up any remaining rare materials you still need.
Quest 2: Obtain the Eminence Clan
Clan rerolls drop from chests and boss kills. However, redeeming active Sailor Piece codes is the fastest and most resource-efficient way to get free rerolls without spending Gems.
Quest 3: Reach Floor 51 in the Infinite Tower 5 Times
Head to Tower Island and open the Infinite Tower Portal. Defeat successive bosses to climb the floors and reach Floor 51 across five separate runs to complete this quest.
Completing all three quests rewards you with the F move and a ~30% permanent damage increase to the Atomic Sword, making it one of the strongest weapons in the entire game at full unlock.
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