If you’ve reached the late game in Sailor Piece, there’s one mode that completely changes your progression speed… Boss Rush.
This mode is not just about fighting bosses. It is where you farm Rush Coins, upgrade your stats permanently, and push your character to the next level with massive boosts like damage, crit, HP, and luck.
However, many players either don’t farm it efficiently or waste time on the wrong difficulty.
In this guide, you’ll learn everything about Sailor Piece Boss Rush, including how it works, best difficulty, rewards, upgrades, and the fastest way to farm it.
What Is Boss Rush in Sailor Piece?
Boss Rush is a 15-wave dungeon mode where you fight bosses continuously within a time limit.
Each run:
- Has 15 waves of bosses
- Includes a 5-minute timer
- Rewards Rush Coins, gems, and coins
- Can be played solo or with a team
The faster you clear waves, the better your rank and rewards.
Boss Rush Time Ranking System
| Rank | Clear Time |
|---|---|
| SSS | Under 30 seconds |
| SS | Under 60 seconds |
| S | Under 120 seconds |
| A | Under 180 seconds |
| B | Under 240 seconds |
| C | Under 300 seconds |
Faster clears = more Rush Coins.
How to Start Boss Rush
To enter Boss Rush, you first need Rush Keys, which are required to open the dungeon.
How to Get Rush Keys
| Method | Details |
|---|---|
| Merchant | Buy for 175 Gems (Sailor Island) |
| Chests & Quests | Random drops |
| NPC Farming | Best method with AoE builds |
| Codes | Occasionally available |
Once you have a key:
- Go to Sailor Island
- Find the Boss Rush NPC
- Spawn the portal
- Select difficulty
You can also enable auto-play for AFK farming.
Boss Rush Difficulties (Full Breakdown)
Boss Rush has four difficulty levels, each increasing boss HP and rewards.
Boss Rush Difficulty Table
| Difficulty | Boss HP (Wave Progression) | Rush Coins | Modifiers |
|---|---|---|---|
| Normal | W1: 90M → W15: 1.8B | SSS: 2 to 6 | Damage Reduction 35% |
| Medium | W1: 270M → W15: 5.4B | SSS: 3 to 8 | Damage Reduction 70%, Lifesteal 50% |
| Hard | W1: 675M → W15: 13.5B | SSS: 5 to 10 | No reduction, no lifesteal |
| Extreme | W1: 1.8B → W15: 36B | SSS: 8 to 14 | Iframes, no lifesteal |
Which Difficulty Should You Play?
- Best for farming: Normal or Medium
- Best balance: Medium
- Avoid: Extreme (too slow for farming)
Boss Rush Rewards
Apart from coins and gems, Boss Rush also drops:
- Rush Coins (main currency)
- Rare items
- Special weapons (like Sin of Pride sword)
Rush Coins are the most important because they unlock permanent upgrades.
Boss Rush Store (Full Items List)
You can spend Rush Coins in the Boss Rush Shop, but this is not the best use early on.
Shop Items
| Item | Cost |
|---|---|
| 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 | 1200 |
👉 Best strategy: Only spend here after maxing upgrades.
Boss Rush Upgrades (Most Important Part)
This is where Boss Rush becomes overpowered.
Upgrades give permanent stat boosts that apply everywhere in the game.
Boss Rush Upgrade Table
| Stat | Total Cost | Max Value |
|---|---|---|
| Damage | 1350 | 25 (+5% per level) |
| Critical Damage | 1350 | 15 (+3% per level) |
| Critical Chance | 1350 | 5 (+1% per level) |
| HP | 850 | 37.5 (+7.5% per level) |
| Luck | 1725 | 15 (+3% per level) |
Total Cost to Max Everything
👉 6,625 Rush Coins
Best Boss Rush Farming Strategy
Most players waste time trying to push higher difficulty, but the real strategy is different.
The fastest farming method is:
- Play Medium difficulty
- Use high DPS builds
- Clear waves in under 1 minute
- Repeat continuously
Best AFK Farming Setup
For AFK farming, you need consistency, not difficulty.
- Use King of Heroes (spam V)
- Avoid swords for AFK
- Use AoE damage builds
- Farm with 2 to 3 players
How Long Does It Take to Max Boss Rush?
Let’s break it down realistically.
| Factor | Value |
|---|---|
| Average coins per run | 5 |
| Runs required | ~1300 |
| Time per run | ~1 minute |
| Total time | ~21 to 22 hours |
👉 This is why efficiency matters more than difficulty.
Pro Tips to Farm Faster
Instead of grinding randomly, follow this:
Focus on speed, not difficulty. Faster clears give more coins over time.
Always farm with a small team because bosses scale with players, but damage output also increases.
Use runes like Primordial Rune to boost damage significantly.
Avoid Extreme mode unless you want a challenge, not efficiency.
FAQs
How do you get Rush Keys fast?
Farm NPC mobs using AoE builds or buy from the Merchant.
What is the best Boss Rush difficulty?
Medium difficulty gives the best balance of speed and rewards.
What should I spend Rush Coins on?
Upgrade stats first, then spend on shop items later.
Is Boss Rush worth it?
Yes, it is one of the best ways to increase your overall power in Sailor Piece.
Final Thoughts
Boss Rush is not just another game mode… it is one of the most important progression systems in Sailor Piece.
If you farm it correctly:
- You gain permanent stat boosts
- Increase damage and survivability
- Progress faster than most players
Play smart, focus on efficiency, and Boss Rush will completely change your gameplay.
Abhigyan identifies himself as a tech geek, gaming cognoscenti, and also a connoisseur of music. Unidentified and mysterious phenomena never fail to gather his undivided attention. When not reading about bizarre and perplexing entities across the Universe, he can often be found cheering for his favorite teams in Football.