Rai U Overview
The Rai U is a legendary lightning-infused katana that excels at applying relentless pressure in PvP engagements. With fast swing speed and chain-lightning mechanics baked into its skill kit, the Rai U allows skilled players to overwhelm opponents through rapid hit chains and unpredictable teleport strikes. Its lightning element adds bonus damage on critical hits, making every exchange potentially lethal for the enemy.
The weapon's aggressive playstyle demands sharp reaction time and combo execution. While its fast attacks and teleport skills dominate 1v1 encounters, the Rai U suffers against enemies who can absorb its burst and retaliate during cooldown gaps. Players who master its hit-and-run rhythm become some of the most feared duelists on the server. The weapon's iconic lightning trail effects also make it one of the most visually striking blades in the game.
| Stat | Value |
|---|---|
| Tier | A |
| Sea | First |
| Role | PvP pressure |
| Swing Speed | Fast |
| Base Damage | 1,050 per M1 |
How to Get Rai U
- Boss Drop: Defeat the Thunder King boss in the First Sea. The Rai U has an 8% drop rate, making it a rarer pull than most A-tier weapons. Coordinate with a crew to farm this boss efficiently.
- Trading: Purchase from other players via the trading market. Prices range from 300K to 500K Beli, reflecting its high PvP demand and lower drop rate.
- Event Exchange: Occasionally available through limited-time lightning-themed event exchanges during summer updates.
Move Set
M1 Combo (Basic Attacks)
A rapid four-slash combo with lightning trailing each blade swipe. Each hit deals 1,050 damage with a slight chain-lightning bounce to nearby enemies within 3 meters. The final hit triggers a small static burst that briefly slows the target.
Skill 1: Thunder Slash
- Damage: 2,600
- Cooldown: 7 seconds
- Range: 10 meters (chain radius)
- Description: A charged lightning slash that fires a chain-lightning projectile, bouncing between up to three nearby enemies. The bounce damage decreases by 25% per target hit, making it strongest in 1v1 but still useful in group fights.
Skill 2: Lightning Step
- Damage: 2,200
- Cooldown: 10 seconds
- Range: 15 meters (teleport distance)
- Description: Instantly teleport behind the targeted enemy and deliver a quick strike. The teleport tracks the target and is excellent for closing gaps or dodging incoming attacks mid-combo. Leaves a static field at the departure point.
Skill 3: Storm Breaker
- Damage: 4,800
- Cooldown: 20 seconds
- Range: 18 meters (AoE radius)
- Description: Raise the blade skyward and call down a massive thunder strike in a wide area around the user. All enemies within the radius take heavy lightning damage and are briefly stunned for 1.5 seconds, setting up follow-up combos.
Combo Potential
- Lightning Step into Thunder Slash - Teleport behind the enemy with Lightning Step for 2,200 damage, then immediately Thunder Slash while they turn. Expected damage: ~4,800.
- M1 x4 into Storm Breaker - Land the full basic combo for 4,200 damage, then cast Storm Breaker as the static slow wears off. Expected damage: ~9,000.
- Storm Breaker into Lightning Step into M1 - Open with Storm Breaker to stun the area, teleport to the primary target with Lightning Step, and unleash an M1 string while they recover. Expected damage: ~9,250.
Upgrade Path
The Rai U benefits from lightning-specific enchantments that amplify its chain and burst mechanics:
- Refinement: Upgrade at the blacksmith using 3 Thunder Ore + 80K Beli per level. Each level adds +5% base damage and extends chain-lightning bounce range by 0.5 meters.
- Chain Lightning+: Thunder Slash bounces to two additional targets and retains 15% more damage per bounce.
- Thunder God: Storm Breaker stuns for an additional 1 second and deals 10% more damage to stunned enemies.
- Swift Bolt: Lightning Step cooldown reduced by 3 seconds and adds a secondary slash after the teleport strike.
Pros and Cons
Pros
- Fastest swing speed among A-tier weapons, enabling rapid pressure
- Lightning Step provides unmatched mobility and gap-closing
- Storm Breaker offers reliable AoE stun for team fights
- Chain-lightning mechanics add consistent extra damage
- Excellent 1v1 dueling weapon with strong combo potential
Cons
- Lower raw damage per skill compared to slower A-tier weapons
- Relies heavily on cooldown management; vulnerable during gaps
- Thunder King drop rate is low at 8%
- High market price makes it less accessible for new players
Best Pairings
- Fruit: Lightning Fruit - The Lightning Fruit amplifies all electric effects and adds a passive chain-lightning chance on every M1 hit, stacking with Rai U's innate bounce for devastating pressure.
- Fighting Style: Electro Style - Electro Style's dash attacks synergize with Lightning Step for double-teleport combos that overwhelm any opponent.
- Race: Mink - Mink's electro passive bonus directly boosts Rai U's lightning damage on all skills and basic attacks by 10%.
Tips and Tricks
- Lightning Step can be used defensively to teleport away from danger by targeting an enemy behind you or to the side.
- Chain Lightning bounces prioritize the nearest unhit target, so position yourself between two enemies to guarantee both bounces.
- Storm Breaker has a brief wind-up animation; cast it after a knockdown or stun to ensure enemies cannot dodge.