The Dark Ring is a Legendary-rarity item in Sailor Piece that sits at the center of mid-game progression. You need it to perform your third Ascension and to purchase the Jinwoo sword, making it one of the most farmed drops on Sailor Island. The problem is that it only comes from one boss, that boss shares a spawn with another, and the drop rate hovers around 7 percent. Expect to spend some time here.
Quick answer: Defeat the Jinwoo boss inside the main building on Sailor Island. The Dark Ring has a 7% base drop chance. You can also obtain Dark Rings through player trading.

Where to find the Jinwoo boss
Jinwoo spawns inside the central dojo on Sailor Island. You can reach the island by using any nearby teleporter. Once you arrive, head to the main building in the middle of the area — Jinwoo stands inside when he's the active boss.
There's a catch. Jinwoo shares his spawn point and respawn timer with the Alucard boss. The two alternate, with roughly 10 to 15 minutes between spawns. If Alucard is up when you arrive, you have two options: defeat Alucard so that Jinwoo spawns next, or hop to a different server and check whether Jinwoo is already there. Killing Alucard is generally the faster and more reliable approach, and it also drops useful loot like the Blood Ring (Mythical, 2% chance) and Soul Amulet (Legendary, 8% chance).

Dark Ring drop rate and how to improve it
The base drop chance for a Dark Ring from Jinwoo is 7%. Some estimates place it as high as 9% under certain conditions, but 7% is the confirmed floor. Since you'll need up to five Dark Rings for Ascension 3 alone — plus three more if you want the Jinwoo sword — plan on fighting this boss dozens of times.
You can push the effective drop rate higher by stacking Luck bonuses. Accessories, Titles, and any active developer boosts all contribute to your Luck stat, which increases item drop chances across the board. If you've already completed earlier Ascensions, those permanent Luck bonuses apply here too.

Trading for Dark Rings
If the grind feels too steep, trading is a legitimate alternative. Open the trade menu by pressing the trade button on the left side of your screen, then select the player you want to trade with. The interface splits into two panels — yours on one side, theirs on the other. Agree on terms and confirm. Dark Rings are in high demand, so expect to offer something of comparable Legendary or Mythical value in return.
What the Dark Ring is used for
The Dark Ring currently serves two purposes, both tied to NPCs on Sailor Island.
Ascension 3 requirements
Speak to the Ascension NPC on the edge of the Jinwoo/Alucard boss arena to begin your third Ascension. The full requirement list is substantial:
| Requirement | Amount / Detail |
|---|---|
| Dark Rings | 5 |
| Dismantle Fangs | 7 |
| NPCs defeated | 500 |
| Bosses defeated | 50 |
| Total damage dealt | 250,000,000 |
| Abilities used | 500 |
| Shadow Dungeon clears (Easy) | 10 |
| Player level | 6,000 |
Completing Ascension 3 grants permanent bonuses of 10% Gems, 10% Money, 2% Cooldown Reduction, and 5% Luck. That Luck bonus will make every future farming session slightly easier.

Jinwoo sword purchase
The Jinwoo Trainer NPC sits at the rightmost edge of Sailor Island. After finishing the Trainer's quests, you can purchase the Jinwoo sword by turning in the following:
| Item / Currency | Amount |
|---|---|
| Money | 2,500,000 |
| Gems | 7,500 |
| Abyss Edge | 6 |
| Dark Ring | 3 |
| Shadow Heart | 1 |
Abyss Edge (Epic, 17.5% drop chance) and Shadow Heart (Mythical, 2% drop chance) both drop from Jinwoo as well, so you'll naturally accumulate them while farming Dark Rings.

Other notable drops from the Jinwoo fight
Every Jinwoo kill rolls against several loot tables simultaneously. While you're grinding for Dark Rings, keep an eye on these items that share the same boss:
| Item | Rarity | Drop Chance |
|---|---|---|
| Abyss Edge | Epic | 17.5% |
| Shadow Heart | Mythical | 2% |
| Dark Ring | Legendary | 7% |
If you end up fighting Alucard between Jinwoo spawns, his loot pool includes the Blood Ring (Mythical, 2%), Casull (Mythical, 2%), and Soul Amulet (Legendary, 8%). None of that time is wasted — these items feed into other progression paths and hold solid trading value.
Farming Dark Rings is one of those mid-game walls in Sailor Piece that separates casual players from committed ones. The 7% drop rate means patience is non-negotiable, but stacking Luck bonuses and trading smartly can cut the grind down considerably. Once you've cleared Ascension 3 and picked up the Jinwoo sword, you'll have permanent stat boosts and a strong weapon to show for it.