Sailor Piece Infinite Tower Guide
The Infinite Tower is one of the main endgame systems in Sailor Piece. Found on Tower Island, it lets players push through increasingly difficult floors to earn Tower Tokens, improve permanent tower upgrades, and farm exclusive rewards such as the Primordial Rune and Radiant Rune.
What Is the Infinite Tower in Sailor Piece?
Infinite Tower is a floor-based challenge mode built for high-level players. Each run becomes harder as you climb, with stronger enemies, boss encounters, and stacking debuffs. Because the mode also has its own upgrade system and exclusive drops, it is one of the most important late-game activities in Sailor Piece.
How to Unlock Infinite Tower
Travel to Tower Island.
Reach at least Level 8,500.
Use a Tower Key to enter.
Tower Island is the main hub for the Infinite Tower, including the portal, Tower Shop, and tower-related upgrades.
How to Get Tower Keys
Tower Keys can drop from any NPC. Based on confirmed player testing, you are not limited to a single island or one specific enemy type when farming keys. This makes general grinding and high-volume NPC farming a practical way to prepare for Infinite Tower runs.
How the Infinite Tower Works
The Infinite Tower is all about pushing floors for rewards. A random debuff starts appearing every 5 floors, which makes progression harder the longer a run goes. At higher milestones, the challenge scales further, making damage output and efficient farming more important as you aim for deeper runs and better rewards.
Clearing floors rewards players with EXP, Gold, Gems, drops, and Tower Tokens. Tower Tokens are the core currency for this system and are used for upgrades and exclusive shop rewards.
Infinite Tower Upgrade Costs
The following upgrade table is based on confirmed values and reflects the current Infinite Tower costs.
Damage
Level 1 - 750
Level 2 - 1,000
Level 3 - 1,250
Level 4 - 1,750
Level 5 - 2,500
Total Cost: 7,250
Critical Damage
Level 1 - 750
Level 2 - 1,000
Level 3 - 1,250
Level 4 - 1,750
Level 5 - 2,500
Total Cost: 7,250
Critical Chance
Level 1 - 750
Level 2 - 1,000
Level 3 - 1,250
Level 4 - 1,750
Level 5 - 2,500
Total Cost: 7,250
HP
Level 1 - 500
Level 2 - 650
Level 3 - 850
Level 4 - 1,150
Level 5 - 1,500
Total Cost: 4,650
Luck
Level 1 - 1,000
Level 2 - 1,350
Level 3 - 1,750
Level 4 - 2,500
Level 5 - 3,500
Total Cost: 10,100
Max Upgrade Bonuses
Damage: 25% total (+5% per level)
Critical Damage: 25% total (+5% per level)
Critical Chance: 5% total (+1% per level)
HP: 37.5% total (+7.5% per level)
Luck: 15% total (+3% per level)
Total Investment: 36,500 Tower Tokens
Best Upgrade Priority
For the current Infinite Tower meta, Damage and Luck should be prioritized first. Damage improves clear speed and overall consistency, while Luck has the best long-term value for players farming rare tower drops. After that, Critical Damage is the next best upgrade, and Critical Chance should be upgraded afterward if you are not already at 100% critical chance through your build. HP is generally the weakest upgrade and should be left for last.
Top priority: Damage and Luck
Second priority: Critical Damage
Then: Critical Chance if your build is below 100% crit chance
Last priority: HP
Primordial Rune and Radiant Rune Drop Rates
Both runes drop from Infinite Tower only. These rates are confirmed:
Primordial Rune: 0.002% to 0.013% depending on floor
Radiant Rune: 0.0025% to 0.0135% depending on floor
Because the rates improve depending on floor, pushing deeper into the tower is the only way to improve your odds. This makes efficient upgrades, damage scaling, and consistent clears especially important.
Why These Runes Are Meta
Primordial Rune and Radiant Rune are currently considered part of the meta because they are tied to high-end progression and efficient farming. Primordial Rune is valued for offensive scaling, while Radiant Rune is especially important because luck is one of the most useful stats for players targeting rare drops and endgame grind efficiency.
Infinite Tower Rewards
Infinite Tower is not only valuable for rune farming. The mode also gives players a reason to keep climbing through its dedicated Tower Token economy and shop rewards. Tower Tokens can be spent on various exclusive progression items, making every run useful even when you do not get a rare rune drop.
Key Facts About Infinite Tower
Location: Tower Island
Requirement: Level 8,500
Entry Item: Tower Key
Tower Key Source: Can drop from any NPC
Main Currency: Tower Tokens
Exclusive Meta Drops: Primordial Rune and Radiant Rune
Total Upgrade Cost: 36,500 Tower Tokens
Final Thoughts
The Infinite Tower is one of the most important late-game systems in Sailor Piece. It combines scaling combat, permanent upgrades, exclusive rune farming, and a dedicated token economy into one endgame loop. If you want stronger progression, better farming value, and access to some of the most important current rewards, Infinite Tower is one of the best systems to focus on.