If you've been grinding Boss Rush or Infinite Tower in Sailor Piece for upgrades, you've probably noticed the same problem most endgame players run into: these modes are easy to start, but they eat a lot of time if your setup is even slightly off. The fastest route is not complicated, though. We want a build that kills fast, repeats cleanly, and stays stable over long sessions.

From testing this kind of grind, the biggest difference always comes from three things: full damage, good range, and the right reset point. Once those are set correctly, both modes become much easier to farm Sailor Piece Items.

• Best Build for Boss Rush and Tower
• Build priority
• Best Weapons for AFK Farming
• Best weapon choices
• Best Boss Rush Difficulty
• Recommended difficulty by damage
• Best Infinite Tower Reset Floor
• Reset floor rule
• Quick reset guide
• How to Set Up the AFK Loop
• Mode setup summary
• Graphics and Stability Settings
• Recommended settings
• What Actually Makes This Method Fast
• FAQ
• What is the best build for AFK Boss Rush and Tower in Sailor Piece?
• What is the best weapon for this method?
• What is the best Boss Rush difficulty?
• What is the best Tower reset floor?
• Final Thoughts

↖ Best Build for Boss Rush and Tower

For this specific grind, full damage is the correct build.

That's because both modes reward us for clearing repeatedly, not for surviving forever or stacking general farming stats. More damage means faster waves, faster bosses, and more total rewards over time.

The only small exception is Tower rune farming. If you still want a chance at Primordial Rune or Radiant Rune while farming Tower, you can keep a little value from things like:

• Luck race
• Eminence clan
• Fortune passive

Even then, I'd still lean mostly damage. If your build loses too much clear speed, the extra luck usually isn't worth it.

↖ Build priority

↖ Best Weapons for AFK Farming

Range matters a lot more here than people expect. In both Boss Rush and Tower, better range means you hit more enemies, clear waves faster, and waste less time repositioning.

↖ Best weapon choices

From practical use, Ice Queen is the easiest recommendation. It just feels smoother in harder Boss Rush runs and higher Tower floors. If you have it, use it first.

If not, the other two are still very workable. The gap is real, but not so huge that your setup stops functioning without Ice Queen.

↖ Best Boss Rush Difficulty

This is where a lot of players slow themselves down. They pick the highest difficulty they can barely beat, but that usually hurts long-session efficiency.

For AFK farming, the best difficulty is the one your account can clear comfortably and repeatedly.

↖ Recommended difficulty by damage

These are solid starting points.

If you find that your run becomes inconsistent after a while, drop one tier. In long AFK farming, consistency beats a slightly better reward table.

↖ Best Infinite Tower Reset Floor

For Tower, your reset floor matters more than almost anything else.

A lot of players push too high because they want the biggest floor number possible. That looks nice, but it usually lowers rewards per hour if enemies stop dying quickly.

A good starting point for many accounts is Floor 44.

↖ Reset floor rule

Use the highest floor where your clear speed still feels smooth.

If you're still deleting waves instantly at that floor, keep it.

If enemies start surviving too long, lower it.

↖ Quick reset guide

That after testing part matters. The right floor is the one your account can repeat cleanly for a long time, not the one it barely reaches once.

↖ How to Set Up the AFK Loop

The setup itself is pretty simple once your build is ready.

For Boss Rush, the flow is:

1. Choose the right difficulty

2. Clear it once normally

3. Enable replay

4. Turn on your best auto skill

5. Keep a small repeating input active so the session does not go idle

For Infinite Tower, the flow is:

1. Set your auto reset floor

2. Reset five times first to unlock replay

3. Turn on auto replay

4. Enable your main clearing skill

5. Keep the session active with a small repeating input

↖ Mode setup summary

The logic is the same in both modes: remove downtime and protect clear speed.

↖ Graphics and Stability Settings

This part is easy to overlook, but it matters a lot for long farming sessions.

If you want smooth AFK runs, lower the game load as much as possible.

↖ Recommended settings

Lower graphics won't increase damage, but they do help sessions run more smoothly. And in long grinds, stability is part of efficiency.

↖ What Actually Makes This Method Fast

The reason this setup works is not because of one overpowered trick. It works because everything is built around repeatable efficiency.

From experience, the players who farm these modes fastest are usually doing three things well:

• They use a full damage build
• They pick a difficulty or reset floor they can sustain
• They avoid letting the run slow down over time

That's what keeps rewards coming in at a steady rate.

↖ FAQ

↖ What is the best build for AFK Boss Rush and Tower in Sailor Piece?

For upgrades and long farming sessions, full damage is the best choice. Only keep small luck bonuses if you also care about Tower rune drops.

↖ What is the best weapon for this method?

Ice Queen Sword is the best overall pick. It gives the best mix of range and damage for wave-based farming.

↖ What is the best Boss Rush difficulty?

Use the highest difficulty your account can clear consistently. A good benchmark is Extreme at 1000%+ damage, Hard at 800%+, Normal at 600%–800%, and Easy below 600%.

↖ What is the best Tower reset floor?

For many players, Floor 44 is a strong default. If your build is weaker, lower it. If your build is stronger and still smooth, test higher.

↖ Final Thoughts

If you want Boss Rush and Infinite Tower to feel less time-consuming, the best fix is usually not more grinding. It's a cleaner setup. Full damage, strong range, a realistic difficulty, and a tested reset floor will do more for your progress than forcing bad runs for extra minutes.

That's the version of the farm that actually holds up over time.