Boss Rush

Boss Rush is a timed wave mode on Sailor Island. Pay 1 Rush Key for 15 waves in 300 seconds. HP scales +55% per additional player, so solo runs give faster clear times. Rewards Rush Coins spent on permanent stat upgrades.

Overview

Field	Value
Location	Sailor Island (Boss Rush NPC)
Entry cost	1 Rush Key
Waves	15
Timer	300 seconds
HP scaling	HP scales +55% per additional player

Clear Grades

Grade determines Rush Coin payout. SSS is the target for efficient farming.

Grade	Clear Time
SSS	<=30s
SS	<=60s
S	<=120s
A	<=180s
B	<=240s
C	<=300s

Rush Coin Ranges

Difficulty	Coins per Run
Easy	1-6
Extreme	4-14

Permanent Upgrades

Rush Coins buy permanent stat boosts. Full upgrade costs 6,625 Rush Coins total.

Stat	Max Bonus
Damage	+25%
HP	+37.5%
Crit Damage	+15%
Luck	+15%
Crit Chance	+5%

Notable Drops

Drop	Easy Rate	Extreme Rate
Escanor	0.6%	1.85%
The One title	0.85%	1.75%
Sun Armor	0.5%	1.5%