
- Boss Rush is a 15-wave dungeon run where players defeat back-to-back bosses to earn Rush Coins in Sailor Piece.
- Rush Coins are used for late-game stat upgrades and exclusive shop items.
- It takes approximately 21 to 22 hours of continuous, highly efficient grinding (roughly 1,315+ clears) to gather the 6,625 Rush Coins needed to max out all Boss Rush upgrades fully.
For the Sailor Piece players who are already in the late-game and want some extra damage stats or luck, Boss Rush is a perfect way to get them. This system exists as a test of resilience against the strongest bosses. However, if the players come out on top, the rewards can push damage, critical damage, critical chance, luck, and HP to the next level. So, learn about the Sailor Piece Boss Rush in this guide.
What Is Sailor Piece Boss Rush?
Boss Rush is a 15-wave dungeon run with a 5-minute cooldown in Sailor Piece. In this mode, you fight bosses back-to-back in four different difficulty modes of your choosing. Regular coins and gems in Sailor Piece are awarded for every boss clearance.
If you are with other players, dealing 10% total rush HP damage is a must to earn the final rewards. Moreover, with each extra player, the boss’s HP increases by +55%. You are awarded Rush Coins based on the time taken to clear the waves and their difficulty. Here is how the time tiers work for you to earn the end rewards in Boss Rush:
- SSS: clear in 30s or less
- SS: clear in 60s or less
- S: clear in 120s or less
- A: clear in 180s or less
- B: clear in 240s or less
- C: clear in 300s or less
To start the Boss Rush run, you will need Rush Keys in Sailor Piece. These are legendary items in Sailor Piece that you can earn in multiple ways.
How to Farm Sailor Piece Boss Rush Keys Fast
There are three ways to get Rush Keys: buying them from the Merchant on Sailor Island (175 Gems), getting them from Chests/Quests/ Sailor Piece Codes, or farming NPCs. To farm the keys quickly from NPCs, use AOE damage swords or melee styles in Sailor Piece.
How to Enter Boss Rush in Sailor Piece
Once you have the Rush Keys, teleport to the Sailor Island. From there, look for the Boss Rush NPC on the right side. Interact and click the Spawn button.
Once the dungeon loads, you can select the difficulty. After the 15th wave, the pay and replay option will appear. You can do this to keep playing Boss Rush. Tick the auto-play option to AFK farm the Boss Rush.
Sailor Piece Boss Rush Difficulties and Drop Rates
Now that you know how to play Boss Rush, here is a detailed breakdown of each difficulty level’s boss HP and the Rush Coin (min-max) drop chances:
Difficulty Boss HP Rush Coins Difficulty Modifiers Normal W1: 90M
W2: 112M
W3: 135M
W4: 180M
W5: 225M
W6: 270M
W7: 315M
W8: 360M
W9: 450M
W10: 585M
W11: 720M
W12: 900M
W13: 1.08B
W14: 1.35B
W15: 1.8BSSS: 2-6
SS: 2-5
S: 2-4
A: 2-4
B: 2-3
C: 1-3Damage Reduction -35% Medium W1: 270M
W2: 338M
W3: 405M
W4: 540M
W5: 675M
W6: 810M
W7: 945M
W8: 1.08B
W9: 1.35B
W10: 1.75B
W11: 2.16B
W12: 2.7B
W13: 3.24B
W14: 4.05B
W15: 5.4BSSS: 3-8
SS: 3-7
S: 3-6
A: 2-5
B: 2-4
C: 2-4Damage Reduction -70%
Lifesteal -50%Hard W1: 675M
W2: 844M
W3: 1.01B
W4: 1.35B
W5: 1.69B
W6: 2.02B
W7: 2.36B
W8: 2.7B
W9: 3.38B
W10: 4.39B
W11: 5.4B
W12: 6.75B
W13: 8.1B
W14: 10.12B
W15: 13.5BSSS: 5-10
SS: 4-8
S: 3-8
A: 3-7
B: 3-6
C: 3-5Damage Reduction Disabled
Lifesteal Disabled
iFrames DisabledExtreme W1: 1.8B
W2: 2.25B
W3: 2.7B
W4: 3.6B
W5: 4.5B
W6: 5.4B
W7: 6.3B
W8: 7.2B
W9: 9B
W10: 11.7B
W11: 14.4B
W12: 18B
W13: 21.6B
W14: 27B
W15: 36BSSS: 8-14
SS: 7-12
S: 6-11
A: 5-9
B: 4-8
C: 4-7Damage Reduction Disabled
Lifesteal Disabled
iFrames 2.5s
Along with the Rush Coins, you can also get the Sin of Pride sword, inspired by Escanor in Sailor Piece, from the Boss Rush. Now comes the key question…
What to Buy with Rush Coins in Sailor Piece?
The Rush Coins are used for two key things: Rush Store purchases or Boss Rush upgrades in Sailor Piece. Here is the full breakdown:
Boss Rush Store
The Boss Rush shop is not the best place to spend your coins. However, if you have already upgraded your Boss Rush stats, then you can go for the Aura Crate to get Auras in Sailor Piece.
Item Rush Coin Sun Armor 250 Trait Reroll 2 Clan Reroll 5 Race Reroll 2 Boss Key 1 Dungeon Key 2 Common Chest 1 Rare Chest 3 Epic Chest 6 Legendary Chest 15 Mythical Chest 40 Secret Chest 400 Aura Crate 1.2K
Boss Upgrades
To complete the full Boss Rush upgrades, you will need a total of 6,625 Rush Coins in Sailor Piece. Here is the full upgrade breakdown:
Stat L1 L2 L3 L4 L5 Total Cost Max Stat Value Damage 100 150 250 350 500 1350 25 (+5%/level) Critical Damage 100 150 250 350 500 1350 15 (+3%/level) Critical Chance 100 150 250 350 500 1350 5 (+1%/level) HP 75 100 150 200 300 850 37.5 (+7.5%/level) Luck 125 200 300 450 650 1725 15 (+3%/level)
Tips and Tricks to AFK Farm Boss Rush Quickly
To maximize your Rush Coin farming efficiency, team up with two similarly geared players to AFK farm Normal mode. This difficulty hits the sweet spot for rapid clears while offering payouts nearly identical to Medium.
With that said, here are some quick tips that you can use to farm Boss Rush coins fast in Sailor Piece:
- Optimal AFK Melee Builds: Equip King of Heroes (spam V) for the best results, and avoid using swords entirely since they lack reliable AFK potential. If you still want to go for higher difficulty, Ice Queen (spam V) is a solid choice.
- Avoid Extreme Mode: Going for the highest difficulty is not worth the time investment to grind. The difficulty slows down your runs, even if you are using the absolute best damage builds.
- Use Primordial Rune: We suggest you farm the Infinite Tower to get the Primordial Rune. This rune in Sailor Piece increases damage significantly.
How Long Does It Takes to Max Boss Rush Upgrades in Sailor Piece
As we said before, fully maxing out all Boss Rush upgrades requires a total of 6,625 Rush Coins. By utilizing the current optimal AFK strategy on Medium mode, you can consistently achieve S or SS completion ranks in under a minute, yielding an average of 5 coins per run.
At a steady pace of 60 or more clears per hour, you will need approximately 1,315 to 1,325 total runs to reach your target. Ultimately, this translates to an estimated continuous grinding time of roughly 21 to 22 hours to afford every upgrade.
So, did you complete your Sailor Piece Boss Rush upgrades yet? If you are done with it, make sure you use the stat rerolls in Sailor Piece to upgrade your stats further.
Buy Rush Keys from the Sailor Island Merchant for 175 Gems, or find them via chests, quests, and codes. Alternatively, farm them quickly by defeating NPCs with large AoE attacks.
Equip the King of Heroes melee style and spam the ‘V’ ability for the easiest AFK wave clears.
To earn Rush Coins in Sailor Piece, you must successfully complete the Boss Rush dungeon. You are awarded Rush Coins at the end of a successful 15-wave run.