Sailor Piece Infinite Tower Guide

The Infinite Tower is one of the most rewarding gamemodes in all of Sailor Piece — and critically, it is the only place in the entire game where you can obtain its two rarest items: the Radiant Rune and the Primordial Rune. For endgame players chasing the absolute best gear, the Tower is a long-term destination rather than a quick farm. This complete guide covers exactly how to enter, how the floor structure works, what drops at each depth, and the build you need to climb deep enough to actually see those legendary rewards.

1How to Enter the Infinite Tower

The Infinite Tower is accessed on Tower Island. To enter you need two things: a Tower Key, and a minimum player level of 8,500. Tower Keys are farmed from the enemies on Ninja Island and Lawless Island, so stockpile a handful before each session. Once inside, the structure is simple: you clear sequential floors of escalating enemy waves, with a boss encounter waiting as a checkpoint every fifth floor.

2The Rune Rewards

The deeper you climb, the better the loot becomes — the Tower drops exclusive weapons, outfits and auras you cannot get anywhere else. But the real prizes are the two Secret runes that drop only here. The Radiant Rune sits at a 0.0015% drop chance and is frequently called the single rarest drop in the entire game. The Primordial Rune, at 0.0025%, grants a staggering +120% Damage at max level. Every Tower run also pays out Tower Tokens for the Tower Shop, so no run is ever wasted.

3The Build You Need to Climb

There is no pity counter on the Tower rune drops — climbing deep is pure persistence, which means survivability matters just as much as raw damage. The floors scale fast, and a glass-cannon build that dies on floor 30 will never see the rewards waiting on floor 60. Bring a maxed Mythical weapon, push your Crit Chance and Crit Damage high at the Stat Master, and keep a healthy HP pool so you can absorb the deeper waves. A Damage relic and a strong Clan passive make a real, measurable difference on the longest runs.

1. 1

   Farm Tower Keys

   Tower Keys drop from Ninja Island and Lawless Island enemies. Stockpile several before a session.

2. 2

   Gear for survivability

   Max your HP and Crit stats — the floors scale fast and dying ends the run.

3. 3

   Climb floor by floor

   Clear waves and beat the boss every 5 floors — each checkpoint banks your progress.

4. 4

   Spend Tower Tokens

   Every run banks Tower Tokens for the Tower Shop, so progress is guaranteed even without a rune.