Rengoku ranks among the strongest swords in the 
Second Sea: simple acquisition, extreme damage, moves that break 
Instinct and especially the rare ability to stun 
Blade users, shared only with 
Saishi. Bonus: equipping this demon-forged katana unlocks the "Samurai" title (#131).
How to get it
Use the 
Hidden Key to open the hidden chest at the 
Ice Castle (Second Sea): it can be found under the stairs, just below the 
Awakened Ice Admiral, with the entrance on the right. The only real obstacle is the Hidden Key itself, which has a low drop rate.
Upgrades
 Materials | Effect |
|---|---|
 Vampire Fang x8 Magma Ore x20 Scrap Metal x15 |
+8% Damage |
Moveset
| Key | Move | Preview | Description |
|---|---|---|---|
| M1 | Normal Attack | Three slashes, then a thrust on the fourth. | |
| Z | Demon Slayer Mas. 150 |
You dash while leaving a trail of orange and red flames. If you hit, you slash the enemy at full speed followed by three fire slashes: damage in ticks and burn for about 2 seconds. cooldown 9s · energy 20 |
|
| X | Burning Slash Mas. 350 |
Two variants: tapped, a horizontal flame slash that leaves a trail on the ground and burns the target (damage over time); held, your screen turns red before a massive wave of flames with extended damage, with the same burn. cooldown 13.5s · energy 30 |
Strengths and weaknesses
- Extreme damage, with burn and damage over time
- Both moves break Instinct on direct contact
- Stuns Blade users (trait shared only with Saishi)
- Very fast dash and almost no endlag
- Good range, good knockback, true combo potential
- Melts Shark and
Cyborg before their race ability activation
- The Hidden Key drop rate is low
- Dash on the fourth M1: tedious farming
- Demanding mastery (350 for [X]) and poor in water
- [Z] single-target and flame trail dodgeable without stun
- No burn AoE in the air: much harder to land in the air
Our take
THE reliable choice of the Second Sea for PvP: monstrous damage, broken Instinct and anti-Blade, hard to ask for better at this stage of the game. Farm the Hidden Key as soon as possible; only the dash on the fourth M1 makes it less enjoyable for pure grinding.
Update history
Sword : Rengoku·Released : Update 13
Fox Lamp
Gravity Blade
Hallow Scythe
Iron Mace
Katana
Koko
Longsword
Midnight Blade
Oroshi
Pipe
Pole (1st Form)
Pole (2nd Form)
Rengoku
Saber
Shark Anchor
Shark Saw
Shizu
Soul Cane
Spikey Trident
Trident
Triple Dark Blade
Triple Katana
True Triple Katana
Tushita