Type
Sword
Rarity
Legendary
Source
Hidden Key
Location
Ice Admiral’s Hidden Room
How to Get the Rengoku Sword
To obtain Rengoku, you must find the Hidden Key dropped with a 5% chance by the Awakened Ice Admiral or a ~0.5% chance by Arctic Warriors and Snow Lurkers.
Use the key to unlock a secret room beneath the Ice Admiral’s stairs and open the chest inside.
Reward: Rengoku Sword + Title: Samurai
Abilities & Showcase
Demon Slayer (Z)
150
Z
A fast forward dash leaving a red-orange trail. If it hits, you execute rapid slashes that cause high tick damage. Quick cooldown and high combo potential.
Burning Slash (X)
350
X
Launches a wide fire slash that leaves a flame trail on the ground. On hit, it burns the target over time and breaks Instinct.
Upgrading the Rengoku Sword
| Grade | Materials | Effect |
|---|---|---|
| 1 | Vampire Fang x8, Magma Ore x20, Scrap Metal x15 | +8% Damage |
Combos, Pros & Cons
Pros
- Very high damage output
- Great for PvP with strong pushback
- [Z] Demon Slayer is fast and low cooldown
- [X] Burning Slash breaks Instinct and has burn effect
- Stylish effects and smooth animations
Cons
- Hidden Key is hard to get (low drop rate)
- Not effective against Chop users
- [X] has short range despite wide AoE
- [Z] targets a single enemy with limited AoE
- Requires high mastery (150/350)
Rengoku Lore & Trivia
The Rengoku Sword was added in Update 13 as an Easter egg and later became a powerful PvP sword. When Aura is activated, the flames shimmer in red, even if using a different Aura color.
The sword is worn on the left hip and mimics a traditional katana, giving players a samurai aesthetic. When using Buddha, the aura effect becomes very thin, offering a unique visual twist.
Rengoku is a perfect blend of aesthetics, damage, and fire-based utility. If you enjoy aggressive swordplay with flashy moves and status effects, Rengoku is a must-have for your arsenal.
