What is Single Blade Online?
Single Blade Online (SBO) is a single-player ARPG set in a medieval fantasy world playable within Fortnite.
It packs the exhilaration of "hunting × sword action" into a compact experience: slash enemies with your blade while progressing through hunting missions, culminating in an epic boss battle against a dragon.
SBO's theme is Medieval Fantasy × Hunting × Sword Action.
We designed fields where "run, slash, dodge" shines, featuring combat in flower-dotted grasslands and open terrain.
Check out the trailer below for a quick glimpse of the game's world, combat tempo, and the intensity of the dragon battle.
The Flow of SBO Gameplay
The flow of SBO gameplay is as follows:
- Set out into the vast field
- Defeat enemies across the map to progress hunting missions
- Challenge the dragon awaiting you at the end
- Land the finishing blow... and trigger the "Last Attack" cutscene!
The clear loop of Exploration → Combat → Defeat → Boss Battle offers a satisfying pace, letting you experience the thrill of "hunt and finish" in a single 10-20 minute play session.
Ready to play now? Enter the Island Code "5461-0030-6080" in Fortnite.
Five Highlights of SBO
Here are the five highlights of SBO.
- Fast-paced sword action delivers a satisfying tempo: Close-quarters combat prioritizes attack feedback and rhythm. You'll find yourself effortlessly slicing through enemies in a flow where you'll realize you've chained combos together.
- Dragon Boss Battles: Experience the sheer scale and strategic depth only massive bosses can deliver. Their size makes reading attack wind-ups, judging distance, and timing dodges thrilling! How you handle their "powerful strikes" becomes the climax of each fight.
- Last Attack Cinematics for a Satisfying Finale: Landing the final blow on a boss triggers a cinematic finish cutscene. The presentation fully amplifies that "I defeated it!" sense of accomplishment.
- Skills Change Your Tactics:
- METEOR: Overwhelm with a powerful special attack
- HEALING: Recovery for regrouping
- STEP: The cornerstone of evasion. The action that defines your movement.
- STEP features a "Risk & Reward" mechanic: During STEP's invincibility frame, deliberately taking damage can quadruple your damage output. Play it safe or go all-in for firepower—your judgment shines through.
Who is SBO for?
SBO is designed for players who want to experience the complete journey from hunting enemies to challenging a massive boss and delivering a spectacular finishing blow—all within a fast-paced play session.
Especially if you like any of the following, you'll be hooked!
- Enjoying sword action while dashing around the field to hunt
- Enjoying "large bosses" like dragon battles
- Enjoying the final attack sequence (finishing move)
UEFN Technical Overview: Building an Action RPG with Verse
Single Blade Online combines UEFN devices with Verse to connect mission progression, enemy behavior, player skills, boss battles, and cinematic sequences into a complete action RPG system.
Reusable Mission and Monster Architecture
The three hunting missions and the boss battle are built on a shared base class named room_base_manager. Common systems—including combat start and completion, player participation, mission tracking, checkpoints, map indicators, and battle-area control—are implemented once in the base class. Each mission then adds only its own enemy composition and completion conditions.
The monsters follow a similar structure. Shared features such as health, damage processing, spawn and elimination sequences, health bars, and map indicators are implemented in monster_base. Barghest, Cannon, Griffon, and Dragon inherit from this class and add their own movement and attack patterns. This modular structure makes it easier to add new missions and enemy types without rebuilding the entire combat system.
Movement-Aware STEP and Perfect Dodge
The STEP system periodically records the player’s position in a ring buffer.
When STEP is activated, it compares the latest position with an earlier sample to calculate the player’s recent movement vector.
This allows the dodge to follow the direction in which the player is actually moving.
When an enemy attack overlaps with the STEP window, a perfect dodge is triggered.
The system restores health and shield values relative to their state at the beginning of the dodge, applies a small heal, and activates visual effects, camera shake, and hit-stop feedback.
It also grants a temporary four-times damage boost, creating the risk-and-reward mechanic at the center of SBO’s advanced combat.
Custom Hit Detection for METEOR
While METEOR is active, a damage volume continuously follows the player.
The system represents the player’s attack area as a cylinder and each monster’s hit area as an oriented box.
Projection-based overlap tests are then used to determine whether the special attack has hit the monster.
Instead of relying only on the distance between two positions, this custom calculation can account for the size and orientation of different monsters.
The same underlying system can also be reused for future skills with different shapes and attack ranges.
Dragon Battle Logic and the Last Attack
The dragon selects from multiple behaviors, including close-range attacks, backward movement, attacks targeted at the player’s position, and large arena-wide attacks.
When an attack requires repositioning, the system searches for a suitable location that is not too close to the player or other monsters before moving the dragon.
When the boss is defeated, Verse identifies the player who delivered the final blow and transitions into the Last Attack sequence.
A dedicated camera, slow-motion cinematic, and HUD presentation work together to emphasize the finishing moment.
Events and asynchronous tasks coordinate the victory condition, player defeat, enemy cleanup, music transitions, and cinematic playback, creating a seamless transition from combat to the final scene.
These systems are mostly invisible to players, but they support the responsive “run, slash, and dodge” combat, distinct enemy behaviors, and cinematic final blow that define the SBO experience.
Reference: List of UEFN Games We Created
If you'd like to see the list of UEFN games we've created, please click the following.
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Our Game in Unreal Editor for Fortnite (UEFN) for Fortnite
You can learn from us. We introduce our game in Unreal Editor for Fortnite (UEFN) for Fortnite. Let's come and play our games! If you want to learn UEFN first, please click the following. March 20, 2024: 🌸🥚Spring Easy Deathrun 250+🌸🥚 [Island Code: 7022-3666-7030] 🌸🥚Spring Easy Deathrun 250+🌸🥚 is a spring-themed deathrun (parkour) game. Deathrun is an action game like a 3D version of Super Mario. You can enjoy cherry blossoms and Easter eggs! https://www.youtube.com/watch?v=zPpiu_hDqTo If you want to play this game, copy the following Island Code "7022-3666-7030" and search for it in Fortnite! April 3, 2024: ✒Math Times Table ...
Summary
SBO is an ARPG focused on "hunting in a medieval fantasy world, engaging in satisfying sword combat, and finishing with a spectacular finale."
If watching the trailer video made you want to play SBO, copy the island code "5461-0030-6080" and search for it in Fortnite!
