Unwavering Soul Error 404 Boss Guide and Rewards

Error 404 Sans is an hourly boss encounter in C.O.D.E World that requires 200 TP to access and yields the Rift Essence item upon defeat. Beating him requires destroying hit-based Void Strings, dodging paired attacks, and clearing four distinct combat phases.

Where Does Error 404 Sans Spawn?

The spawn location is a floating platform connected to the main island of C.O.D.E World by blue strings. Every hour, this entry path appears for players who hold at least 200 TP, which players accumulate through standard progression or a dedicated tp farm. Once the structure materializes, players have four minutes to cross before the bridge vanishes. If two players enter separately, the bridge also closes immediately, locking out anyone else until the next hourly reset.

Preparation depends heavily on player stats and equipment. While the entry requirement is only 200 TP without an enforced reset lock, community documentation on the Undertale AU RPG Wiki explains that taking down Error 404 alone typically requires 8 to 10 resets, or a coordinated group with 6 to 8 resets. In a high-level demonstration uploaded by the YouTube channel Unwavering Soul 9.6, a player cleared the encounter using a level 8000 character at reset 38 with 3000 TP, pairing high-output damage tools with defensive consumables like X Soul and S. Potion from their supply of healing items.

What Attacks Does Error 404 Use in Each Phase?

Combat phases are four progressive encounter stages where Error 404 Sans pairs two simultaneous attacks and summons hit-based Void Strings. He relies on two primary offensive patterns throughout the match: Quad Gaster Blasters and the Bone Zone Combo. The blaster move summons four beam units around a target in a cross shape, while the bone combo fires six targeted bone zones in rapid succession alongside two approaching bone waves. Because he executes two actions at once, jumping or moving diagonally is necessary to manipulate beam angles away from the platform center.

1. Phase 1 starts with Error 404 shrouded in darkness, leaving only his eyes visible while firing standard attack pairs.
2. Phase 2 reveals his full appearance, scattering hazard strings across the arena floor that damage anyone stepping on them.
3. Phase 3 introduces a chequered arena floor pattern where players must position themselves on green tiles while directing blaster angles outward.
4. Phase 4 triggers at 50% remaining health, breaking the arena floor into two halves connected solely by narrow blue strings where Error 404 stands.

Transition periods activate whenever his health bar drops to a threshold. Error 404 pulls himself into the air using strings, turning invulnerable while Void Strings descend onto the battlefield. These entities latch onto players, inflicting slow effects and draining health over time. In Phase 4, the split platform leaves no surrounding barriers, meaning any mistimed jump sends players into the void for an immediate defeat. Once his health reaches zero, he suspends everyone in midair for a final survival test, firing accelerating beams where blue beams require standing completely still and orange beams demand continuous movement.

Which Weapons Work Best Against Void Strings?

Multi-hit gear pieces are attack tools that bypass health bars by chipping away the five required hits per Void String. Void Strings do not have standard numerical HP pools. Because each string requires five distinct hits to shatter, high-damage single-strike weapons struggle to clear them before the drain effect eliminates the player. Equipment that fires multiple projectiles or creates persistent hit zones clears these strings rapidly.

As detailed on the Unwavering Soul community wiki, players who learn how to get bike gain both rapid multi-hit strikes for strings and enhanced jump mobility to avoid arena edges. Pairing a utility tool like Bike with high-damage melee gear such as Eraser Saber, which outputs 516.6 thousand damage per second, balances crowd control during phase transitions with swift boss damage during attack windows.

How Do You Use the Rift Essence Drop?

Rift Essence is an off-hand special item that executes directional WASD cheat codes to cast heals, trigger explosions, or open world portals. When the final beam sequence concludes, a C.O.D.E Eye blasts Error 404, forcing him to drop the item before escaping through a rift. Unlike standard weapons, Rift Essence inputs directional commands to produce eight distinct combat and travel effects.

• AADD (Multi-Slash): Unleashes multi-colored slashes that strike the closest enemy for 225,000 damage per hit.
• WWSS (Glitch Explosion): Produces a blast around the caster, dealing 500,000 damage to all targets in range.
• DDAA (Single Heal): Restores 10% of the player's missing health pool instantly.
• SSWW (Heal Explosion): Generates a green burst that heals 5% max HP for the user and nearby allies.
• DDDA (Status Check): Displays a target player's complete stat table for several seconds after entering their name.
• DWWD (Gift): Grants a random reward consisting of Kromer, Level, TP, or no bonus.
• WWWW (Other World Portal): Opens a gateway directly into the Other World if entrance conditions are met.
• DDDD (Main World Portal): Generates a warp portal leading straight back to the Main World.

Offensive code damage scales higher with every standard reset completed. Completing a true reset doubles the damage output of both Multi-Slash and Glitch Explosion, turning the tool into a potent offensive burst option alongside its utility. Mastering the timing of these directional inputs through established rift essence combinations allows players to navigate between worlds and sustain health across extended combat encounters.

Where does this guide's official Unwavering Soul information come from?

Official details in this guide follow Create a Unwavering soul all bosses Tier List - TierMaker, which describes the game in its own words.

Unwavering soul is a Roblox game with over 95 bosses to fight.

Create a Unwavering soul all bosses Tier List - TierMaker