Demon King (also called Anos) is one of the strongest melee fighting styles in Sailor Piece, built around raw damage output and powerful late-game scaling. Getting it requires completing a prerequisite quest, farming a specific boss repeatedly, collecting several rare drop materials, owning a particular clan, and earning a pity-based title. The whole process takes place on and around Academy Island.
Quick answer: Complete the Demonite Core quest on Academy Island, farm Calamity Seals from NPCs on Shinjinku Island, use those seals to summon and defeat the Demon King boss until you have all required drops and the Demon King title, equip the Voldegoat Clan, then talk to the Anos NPC at the back of Academy Island to unlock the fighting style.
Demon King Fighting Style — Material Requirements
| Material / Condition | Quantity | How to Obtain |
|---|---|---|
| Calamity Seals | 65 | Dropped by any NPC on Shinjinku Island |
| Demonic Fragments | 12 | Dropped by the Demon King boss |
| Demonic Shards | 6 | Dropped by the Demon King boss |
| Destruction Eyes | 2 | Dropped by the Demon King boss |
| Imperial Mark | 1 | Dropped by the Demon King boss |
| Voldegoat Clan | Must be equipped | Use clan rerolls until you land on Voldegoat |
| Demon King title | 1 | Pity reward from defeating the Demon King boss (115 pity counter) |
You need every single item and condition listed above before the Anos NPC will let you purchase the style. Missing even one — including having the Voldegoat Clan actively equipped — will block the transaction.
Complete the Demonite Core Quest
Before you can receive Calamity Seal drops or summon the Demon King boss, you must finish a short prerequisite quest on Academy Island.
Step 1: Travel to Academy Island and speak to the quest-giver NPC near the front of the island to start the Demonite Core quest.
Step 2: Find the first Demonite Fragment. It is hidden inside a tree on Academy Island — look carefully among the trees near the quest NPC. The fragment can be hard to spot, but it is tucked into one of the larger trees.
Step 3: Find the second Demonite Fragment on top of the castle on Academy Island. Climb to the roof and collect it.
Step 4: Return to the quest-giver NPC and turn in both fragments. This completes the Demonite Core quest and enables Calamity Seal drops from NPCs.
Farm Calamity Seals on Shinjinku Island
With the quest finished, Calamity Seals will start dropping from any NPC you defeat on Shinjinku Island. The drop rate is moderate but not instant — expect to spend at least an hour of continuous farming to accumulate a meaningful stack. You will need a minimum of 65 seals just for the purchase requirement, plus additional seals to repeatedly summon the Demon King boss for its exclusive drops.
AFK farming works well here. If you already have a strong AoE fighting style like Gilgamesh equipped, you can set up near a group of NPCs and let auto-attacks handle the grind. Plan on stockpiling well beyond 65 seals, since every boss summon costs seals, and you will need many kills to collect all the rare materials and hit the title pity counter.
Summon and Defeat the Demon King Boss
Step 1: Head back to Academy Island and find the boss summoner NPC. Interact with them to challenge the Demon King boss. Four difficulty tiers are available — Normal, Medium, Hard, and Extreme.
Step 2: Turn on auto-spawn if you plan to farm repeatedly. Spawn the boss once to start the cycle, then defeat it. Each kill has a chance to drop Demonic Fragments, Demonic Shards, Destruction Eyes, and Imperial Marks. Check the drop list in the top-right corner of your screen during the fight to track what you have received.
Step 3: Keep farming. The rare drops — especially Destruction Eyes and the Imperial Mark — are uncommon, so you will likely need dozens of kills. The Demon King title is awarded through a pity system at 115 boss defeats, meaning you are guaranteed to receive it after that many kills, even if it does not drop randomly before then.
Equip Voldegoat Clan Before Purchasing
The Voldegoat Clan is a separate requirement that has nothing to do with boss farming. You obtain it through clan rerolls, which are random. There is no guaranteed way to land on Voldegoat quickly, so start rerolling early while you farm boss materials. You must have Voldegoat actively equipped — not just owned — when you talk to the Anos NPC to finalize the purchase.
Talk to the Anos NPC to Unlock Demon King
Step 1: Once you have all 65 Calamity Seals, 12 Demonic Fragments, 6 Demonic Shards, 2 Destruction Eyes, 1 Imperial Mark, the Demon King title, and the Voldegoat Clan equipped, head to the back of Academy Island.
Step 2: Find the Anos NPC standing behind the main structures. Interact with him and confirm the exchange. If all requirements are met, the Demon King fighting style is immediately added to your melee inventory.
Step 3: Open your inventory, go to the Melee tab, and equip Demon King. The F move is already unlocked by default — there is no separate F move quest for this style.
Demon King Moveset Overview
| Move | Type | Approximate Damage | Notes |
|---|---|---|---|
| M1 (basic attack) | Melee | ~1.2 billion per hit | Consistent single-target damage |
| Z | Multi-hit AoE | ~3.5 billion total | Long animation with multiple hit markers; grants invulnerability during use |
| X | Ranged beam | Lower (variable) | Launches you into the air, then fires a directional beam; also grants invulnerability |
| C | Short-range AoE + punch explosion | ~5–10 billion | Damage scales with stats; you take damage during the animation |
| V | Meteor summon | ~20 billion | Long charge-up with a cutscene; massive hitbox |
| F | Planet-scale AoE | ~51 billion | Highest single-move damage; ground-shaking animation with enormous range |
The Z and X moves both provide invulnerability frames, making them useful for avoiding incoming damage while dealing your own. The C move does not share this property, so be cautious when using it against hard-hitting bosses. The V and F moves are the real damage dealers, with F alone capable of exceeding 50 billion damage at high stats.
How Demon King Compares to Other Top Styles
Demon King sits comfortably among the best fighting styles in Sailor Piece. It excels at single-target boss damage, making it ideal for boss farming and high-difficulty encounters. Strongest in History currently holds the top spot for overall versatility thanks to wider AoE coverage, but Demon King's raw burst damage — particularly from its V and F moves — makes it a strong contender for any player focused on maximizing damage per hit. If you already have Gilgamesh or Gojo and want a meaningful upgrade for late-game content, Demon King is one of the best options available.
Farming the full set of materials takes time, especially hitting the 115-kill pity threshold for the Demon King title. Focus exclusively on this style rather than splitting resources across multiple fighting style grinds, and you will have it equipped and maxed far sooner.