Split Fiction Boss Guide: How to Beat Every Major Boss Fight

How Split Fiction Does Bosses

Unlike most action games where one player can carry the fight, Split Fiction bosses demand both of you stay alive. One death = both restart. This changes everything about how you approach these encounters , you can't have one player hang back as a safety net. But both of you need to know every phase.

Hazelight's boss design here is sharper than It Takes Two. In that game, bosses were more about spectacle than challenge. Split Fiction bosses actually kill you if you're sloppy, and the later ones have attack patterns you need to memorize.

Here's every major boss, in order, with what actually works.

Chapter 1: Corrupted Overseer

The security AI that's gone haywire after Mio and Zoe's simulation merge. It floats around a circular arena shooting tracking orbs and occasionally slamming the ground.

Three attack patterns. That's it. The orbs track slowly enough that you can dodge by walking sideways. The ground slam has a red circle indicator that appears about 1.5 seconds before impact , if you're still inside it, you're dead. The third attack is a laser sweep that covers half the arena at a time. One player baits the laser while the other shoots the glowing core on the Overseer's back.

My advice: assign one person to be the designated baiter for this fight and don't switch mid-fight. The baiter stays close to the boss and calls out which attack is coming. The shooter stays at range and only moves when the baiter says so. This role split works for every boss in the game, not just this one.

Chapter 2: Thorn Colossus

A giant plant creature in a circular arena surrounded by thorn walls. The Colossus has two phases.

Phase 1: It swipes with vine arms and spews poison clouds. The poison lingers for about 10 seconds so watch your footing. One player needs to grab the fire seeds scattered around the arena and throw them at the vines covering the Colossus's core. The other player keeps the boss's attention. After three fire seeds connect, the vines burn away and Phase 2 starts.

Phase 2: The Colossus's core is exposed but it attacks faster. The twist , the fire seeds stop spawning, and you need to use the burning vines from Phase 1 as your fire source. If you burned too many vines in Phase 1, you're making Phase 2 harder. Burn exactly three patches and leave the rest.

Both players need to be in position to attack the core simultaneously for maximum damage. The timing window is about 3 seconds. Count down out loud.

Chapter 3: Deep Sentinel

Mechanical kraken in the underwater facility. Four tentacles plus a central eye.

The gimmick: tentacles only take damage when both players are attacking different tentacles at the same time. Solo attacks do zero damage. This forces you to pick two targets, count down, and hit together. After two tentacles go down, the boss enrages and the remaining tentacles attack 50% faster.

The eye opens for about 5 seconds after all tentacles are destroyed. Both players need to dump every attack into the eye during this window, then the tentacles respawn. You'll need three full cycles to kill it.

The second cycle adds electrical floor panels that activate in patterns. Look for the blue spark warning flash before each panel goes live. The third cycle adds the electrical panels plus tracking mines that chase whoever's closest. The bait player needs to lead mines into walls to detonate them safely.

Chapter 4: Storm Sovereign

Aerial dragon fight. One player on a gryphon, one on floating platforms.

The gryphon player's job is positioning and dive attacks. The platform player handles adds (smaller flying enemies that swarm the arena) and knocks the boss down with ballista shots. When the boss falls, the gryphon dives and both players get a damage window.

The adds are the real threat, not the boss. Ignore them and they'll kill the platform player in about 15 seconds. The gryphon player should call out when adds spawn , the platform player has limited visibility from the ground.

Three knockdowns kills the boss. The third knockdown window is shorter (about 4 seconds instead of 8), so the gryphon player needs to be positioned above the boss before the ballista shot connects.

Chapter 5: Fabricator Prime

The mid-game wall. If you beat this without dying more than five times on your first run, you're better at this game than I am.

The Fabricator Prime copies itself constantly. There are always three copies in the arena. Two are illusions, one is real. Illusions flicker briefly , look for the shimmer effect, not the lights everyone tells you to watch. The shimmer is more reliable.

When the real one takes enough damage, it resets the copies and summons crushers , giant pistons that slam down on fixed patterns. You need to memorize the pattern (left-right-center-left) while also tracking which copy is real. The crushers one-shot you, so positioning matters more than damage output.

Phase 2 at 50% health adds conveyor belts that push you toward the crushers. And then You need to constantly walk against the belt direction while fighting. Phase 3 at 25% adds everything , copies, crushers, belts, plus a laser grid. Maybe this is the hardest mechanical challenge in the game.

Assign roles for this fight and stick to them. One player tracks copies and calls targets. The other handles crusher positioning and belt management. If you try to do both, you'll die.

Chapter 6: Shadow Weeper

No boss list is complete without the Shadow Weeper, even though it's technically a mini-boss. It's harder than half the actual bosses.

The arena is dark. One player carries a lantern that reveals the boss's true position. the other attacks. If the lantern holder moves too far from the attacker, the boss becomes invisible to both players. If the lantern holder stands still, the boss focuses them.

The solution: the lantern holder moves in a circle around the arena's edge while the attacker stays in the center. This keeps the boss visible from all angles and spreads the aggro. Sound cues tell you when the boss is about to teleport , listen for the rising whistle.

Chapter 7: Event Horizon

Reality-warping boss that teleports the arena between sci-fi and fantasy versions. The mechanics change when the arena shifts.

Sci-fi arena: energy shields you need to overload with the hacking tool. Fantasy arena: elemental crystals you need to match by color. The catch is that one player handles the mechanic while the other kites the boss, and the mechanic player's task changes every time the arena shifts.

Every 30 seconds, the boss does a room-wide attack that can only be survived by standing in a specific spot , marked by a faint glow that's easy to miss. Call out the safe spot the instant you see it.

Chapter 8: The Machine

The final boss uses mechanics from every previous chapter. Don't let the nostalgia trip distract you , this fight is genuinely hard.

Phase 1: Corrupted Overseer's laser patterns plus Thorn Colossus's arena denial.

Phase 2: Deep Sentinel's synchronization mechanic plus Storm Sovereign's adds.

Phase 3: Fabricator Prime's copies plus Shadow Weeper's darkness.

The Machine has a massive health pool and you'll see each phase multiple times. Take breaks between attempts if you're wiping. Frustration kills more runs than the boss does. After the third phase completes, there's a brief narrative sequence (don't skip it, the ending is worth watching) followed by the final synchronized platforming escape.

Beat this, and you've earned the credits.

There are more situations where this applies, but you get the idea. Not every mechanic needs its own paragraph.