How to Get and Use Atomic Omen in Sailor Piece (June 2026 Guide)

If you are working toward the Atomic Sword in Sailor Piece, you already know that Atomic Omen is one of the hardest materials to get your hands on. This rare drop from the Atomic Boss has a frustratingly low drop rate, and the grind can feel endless if you go in without a plan. In this guide, I will walk you through exactly how to get and use Atomic Omen in Sailor Piece, from finding the boss on Lawless Island to turning your drops into the powerful Atomic Sword (CID V2). You can also grab free rewards along the way with our Sailor Piece codes for free gems and rewards to make the grind a bit easier.

What Is Atomic Omen in Sailor Piece?

Atomic Omen is a rare crafting material that drops exclusively from the Atomic Boss on Lawless Island. It is classified as a mythical-tier drop, which means the odds of getting one per boss kill are very low. Players need Atomic Omen to craft the Atomic Sword, also known as CID V2, which is one of the strongest endgame weapons in Sailor Piece.

Think of Atomic Omen as the gatekeeper material. You cannot skip it. Without collecting enough Atomic Omen drops, you cannot progress to the Atomic Sword, and you definitely cannot unlock the devastating Atomic F move that makes this weapon stand out from everything else in the game.

On top of its crafting use, Atomic Omen has real trading value in the Sailor Piece community. Players on Reddit and Discord actively trade Atomic Omen for other rare materials like Eminence Essence, Shadow Remnant, and Magic Shard. Experienced players have reported trading 3 Atomic Omen for 8 Shadow Remnant and 8 Magic Shard, making it a valuable currency in the player economy.

How to Get Atomic Omen in Sailor Piece?

Getting Atomic Omen comes down to one activity: defeating the Atomic Boss on Lawless Island. But getting to that boss and actually getting the drop requires preparation. Here is everything you need to know.

Step 1: Reaching Lawless Island

Lawless Island is where the Atomic Boss spawns, and you need to use a teleportation portal to get there. Head to any teleport portal in the game world and select Lawless Island from the destination list. Once you arrive, look toward the right corner of the island where you will find the Atomic Boss Summoner NPC standing near the edge.

This NPC is your gateway to the boss fight. Interact with him, and you will see the option to summon the Atomic Boss using Abyss Sigils. The number of Abyss Sigils required depends on the difficulty you choose, so make sure you have enough stocked up before making the trip.

Step 2: Summoning and Defeating the Atomic Boss

To summon the Atomic Boss, you need Abyss Sigils, which you can obtain by farming mobs on Dungeon Island or purchasing from other players. Once you have enough sigils, interact with the Atomic Boss Summoner NPC on Lawless Island and choose your difficulty level. The boss will spawn, and the fight begins.

The Atomic Boss hits hard, especially on higher difficulties. Bring a strong weapon and plenty of healing items. If you are still working with a basic loadout, consider learning how to get the Ice Queen Sword in Sailor Piece as an intermediate upgrade before taking on harder difficulties.

Team up with other players whenever possible. Group farming not only makes the boss fight faster but also gives everyone a chance at the drop. Many players in the Sailor Piece community organize boss farming sessions through Discord, so joining an active group can significantly speed up your grind.

Step 3: Understanding Drop Rates by Difficulty

The Atomic Boss can be summoned on four difficulty levels: Normal, Medium, Hard, and Extreme. Each difficulty has a different drop rate for Atomic Omen, and the cost in Abyss Sigils goes up as the difficulty increases.

Here is a breakdown of what to expect from each difficulty tier:

• Normal – Lowest Abyss Sigil cost, lowest drop rate. Good for beginners who are learning the boss mechanics.
• Medium – Slightly higher cost, slightly better drop rate. A reasonable middle ground if you can consistently clear it.
• Hard – Notable increase in drop rate with a moderate cost increase. This is where most experienced players farm because the effort-to-reward ratio is the best.
• Extreme – Highest cost and highest drop rate, but the boss deals significantly more damage. Only worth it if you have a strong build and a coordinated team.

Community-verified data puts the base Atomic Omen drop rate at approximately 0.54%. On Hard difficulty, players report noticeably better odds compared to Normal, making Hard the sweet spot for most farmers. Extreme gives the best raw drop percentage, but the increased boss difficulty and higher Abyss Sigil cost mean fewer total runs per hour, which can offset the better rate.

How to Use Atomic Omen in Sailor Piece?

Once you have collected enough Atomic Omen, it is time to put it to work. Atomic Omen is used to craft the Atomic Sword (CID V2) through the Atomic Seller NPC on Lawless Island.

Crafting the Atomic Sword (CID V2)

Before you can craft the Atomic Sword, you need to meet a few prerequisites. The biggest one is that you must already have the Shadow Sword (CID V1). If you do not have it yet, you will need to obtain that first before the Atomic Seller NPC will even offer you the CID V2 upgrade.

Here is the complete list of materials you need to craft the Atomic Sword:

• Shadow Sword (CID V1) – The prerequisite weapon
• Atomic Omen – Multiple drops from the Atomic Boss
• Eminence Essence – Farmed from specific enemies or obtained through trading
• Shadow Remnant – Dropped from shadow-type mobs or traded
• Magic Shard – Found in various locations or traded with other players
• Eminence Incarnate Title – Earned through progression
• Gems – In-game currency for additional costs

Talk to the Atomic Seller NPC on Lawless Island with all materials in your inventory to complete the crafting process. The NPC is located near the boss summoner, so you can farm and craft in the same area without traveling back and forth.

Unlocking the Atomic F Move

The Atomic Sword is powerful on its own, but the real prize is the Atomic F move. To unlock it, you need to complete a series of mastery quests given by the Atomic Master NPC, also found on Lawless Island.

The mastery questline involves several tasks including farming Tower Keys from the Infinite Tower, defeating enemies on specific difficulties, and collecting additional materials. The Eminence Clan provides passive stat bonuses that help with these quests, so if you have access to clan rerolls, aiming for the Eminence Clan is a smart move before starting the mastery grind.

Completing all mastery quests unlocks the Atomic F move, which deals massive AoE burst damage. It is one of the highest-damage abilities in the game and makes the Atomic Sword a true endgame weapon worth every hour of farming.

Tips for Efficient Atomic Omen Farming

The biggest frustration players face with Atomic Omen is the low drop rate. At roughly 0.54%, you are looking at many boss kills before seeing a single drop. Here are strategies that experienced players use to make the grind more manageable.

Farm on Hard difficulty for the best balance. Hard gives a meaningful improvement in drop rate over Normal and Medium without the massive difficulty spike of Extreme. Most experienced players recommend Hard as the default farming difficulty because it maximizes your drops per hour.

Team up with other players. Solo farming is slower and riskier. Group farming lets you kill the boss faster, which means more attempts per hour. Join a Sailor Piece Discord community and organize farming sessions with other players who need Atomic Omen.

Stock up on Abyss Sigils before heading to Lawless Island. Running out of sigils mid-session means wasted travel time. Farm enough sigils on Dungeon Island for 10 to 15 boss attempts before making the trip so you can stay and grind without interruptions.

Consider trading instead of farming. If you have excess materials from other content, check trade values on the Sailor Piece subreddit. Players regularly trade Atomic Omen for Eminence Essence, Shadow Remnant, Magic Shard, and even Reiatsu Cores. Sometimes trading is faster than farming if you have the right materials to offer.

Use free codes to supplement your grind. Codes give you free gems, clan rerolls, and other resources that help with boss preparation. Bookmark our guide on how to get Frost Relic in Sailor Piece as well, since you may want to farm related materials while you are on Lawless Island.

Frequently Asked Questions

Final Thoughts

Farming Atomic Omen in Sailor Piece is a long grind, but the reward is absolutely worth the effort. The Atomic Sword (CID V2) and its F move deliver some of the highest damage output in the entire game, making it a top-tier endgame weapon for any serious player. By farming on Hard difficulty, teaming up with other players, and stocking up on Abyss Sigils before each session, you can make the process significantly faster.

Remember that trading is always an option if the drop rate is getting you down. The Sailor Piece community actively trades Atomic Omen for other rare materials, so check current trade values on Reddit before spending hours on more boss runs. Whether you farm or trade, knowing how to get and use Atomic Omen in Sailor Piece is the key to unlocking one of the best weapons the game has to offer.