Atomic Boss (Cid)
A 2 billion HP summonable boss on Lawless Island, added in the Massive Update (March 25, 2026). Summoned at the Atomic Boss Summoner NPC using Abyss Sigils (Normal=1, Medium=2, Hard=3, Extreme=4). Drops the S+ tier Atomic Outfit accessory (1.23%) and materials needed to purchase the Atomic Sword (Cid V2) from the Atomic Seller NPC. Abyss Sigils drop from Arena Fighter mobs on Lawless Island and Ninja mobs on Ninja Island. Level 12,000+ recommended. Source: allthings.how + beebom.com (2026-03-27).
Atomic Boss (Cid)
Endgame Islands
- Location
- Lawless Island
- Level Required
- 12,000
- Respawn Time
- Summon only (Abyss Sigils required)
- HP
- 2,000,000,000
Boss Stats
| Stat | Value | Notes |
|---|---|---|
| Health | 2,000,000,000 | - |
| Level | 12,000 | - |
| Sea | Endgame Islands | - |
| Difficulty | Extreme | - |
| Respawn Time | Summon only (Abyss Sigils required) | - |
| Drop Count | 6 items | - |
Drop Table
Atomic Boss (Cid) drops 6 items. The rarest drops are Atomic Omen and Eminence Incarnate Title. Farm Atomic Boss (Cid) consistently to accumulate materials for crafting and progression.
| Item | Type | Drop Rate | Rarity |
|---|---|---|---|
| Magic Shard | Crafting Material | 11.5% | Uncommon |
| Shadow Remnant | Crafting Material | 4.01% | Rare |
| Atomic Outfit | Accessory | 1.23% | Very Rare |
| Eminence Essence | Crafting Material | 1.02% | Very Rare |
| Eminence Incarnate Title | Title | 0.75% | Very Rare |
| Atomic Omen | Crafting Material | 0.54% | Very Rare |
Battle Strategy
Atomic Boss (Cid) is one of the hardest bosses in Sailor Piece. Only attempt with a fully optimized endgame build. Solo runs are extremely punishing — a coordinated group is strongly recommended. Make sure your stats, race, and accessories are all maxed before engaging.
Recommended Stats
- ‣Melee / Sword stat: 2500+ for reliable damage
- ‣Fruit stat: 2500+ if running a Devil Fruit build
- ‣Defense / HP accessories recommended for survival
Location & Respawn
Atomic Boss (Cid) is located at Lawless Island, in the Endgame Islands zone. This is an endgame zone. You will need high-level stats and gear before travelling here.
Atomic Boss (Cid) respawns approximately every Summon only (Abyss Sigils required). If you arrive and the boss is not present, wait at the spawn location or switch to a less populated server. Many players farm this boss repeatedly for drop materials, so competition for kills can be high on busy servers.
Recommended Level: 12,000+
Players below level 12,000 will deal significantly reduced damage and may struggle to survive the encounter. Reach at least 13,200 for a comfortable fight.
Quick Reference Cards
At a Glance
Quick Overview
Atomic Boss (Cid)
S+ TierLevel
12000
HP
2,000,000,000
Difficulty
Extreme
Respawn
Summon only (Abyss Sigils required)
A 2 billion HP summonable boss on Lawless Island, added in the Massive Update (M...
Tier Position
Ranked #9 of 26 in Bosses
Atomic Boss (Cid) is in S+ Tier
Drop Table — Atomic Boss (Cid)
Drop rates are approximate and subject to game updates
Patch History
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Combat Tips
- ‣Use Armament Haki to deal full damage
- ‣Bring a fruit build for maximum damage output
- ‣Team up for this boss — solo is extremely difficult
- ‣Respawns every Summon only (Abyss Sigils required)
Location
Last updated: 2026-03-27
Recommended Builds
Boss Synergies
Best Pairings & Synergies
Best Fruits for This Boss
Best Races for This Boss
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Lawless Island Island
Visit the island where Atomic Boss (Cid) spawns.