The Sinking City 2 does not publish an official boss count, and guides disagree: one review recalls only two boss fights, a fan site lists four boss-tier encounters. This guide covers only what is verified: Shoggoth, Slither Prime, the Acheronian Juggernaut, and the Shadow, plus the Deep One Raider as an elite enemy type rather than a confirmed boss. No health or damage numbers appear here, because no reliable source publishes them, and no 1.1.0 change is described as a buff or nerf to any individual boss, because the official note does not name one.
Quick answer
Do not aim for the head. Aim for the glowing pustule-like weak points. A destroyed weak point regrows after a while.
Shoggoth: activate the arena’s three strange devices in sequence, then shoot the devices to force out its eye.
Slither Prime: the final boss. Clear its summoned small enemies first, then hit the glowing head weak point.
Acheronian Juggernaut: a slow mini-boss-grade giant. In enclosed spaces, positioning matters more than damage output.
Deep One Raider is an enemy type, not a confirmed single boss. Do not plan a boss routine around it.
At a glance
Verified boss-tier names: Shoggoth, Slither Prime (final boss), Acheronian Juggernaut (mini-boss grade), Shadow (Holloway finale and main-game enemy)
Elite enemy type, not a confirmed boss: Deep One Raider
Boss total: Disputed (two versus four claims); no official total exists
Universal rule: Glowing weak points, not headshots; stomp downed enemies; retreat to a safe room when outmatched
1.1.0 combat note: Four encounters rebalanced; boss-fight companion commentary less frequent; explosives buffed; Slither weak-point delay shortened
Numbers: None. No health or damage figures are published by reliable sources.
1. Universal rules for every big fight
Headshots are not the answer in this game. The verified rule from reviews is to hit the glowing pustule-like weak points; a destroyed weak point regrows after a while, so keep re-targeting it. Stomp downed enemies after knocking them down by hitting their legs. When ammunition runs low, dodging past non-essential enemies is legitimate, and retreating to a safe room is always an option, since enemies cannot enter safe rooms. In specific boss fights and large arenas, the game respawns supply pickups without limit, with an in-game note joking about it, so a boss fight cannot soft-lock you by running dry.
2. Shoggoth
Shoggoth is a large formless monster, added as a Kickstarter stretch goal, whose bulk, unpredictable attacks, and ability to damage parts of the environment make it a positioning fight. The verified core loop is procedural: activate the arena’s three strange devices in sequence, then shoot the devices to force out its eye. Direct gunfire alone does not reliably advance the fight. Do not stand and trade blows; use the arena’s space and complete the device sequence first. Phase divisions and a per-phase attack list have not been verified, so none appear here.
3. Slither Prime, the final boss
Slither Prime is the final boss, at the end of the final chapter, after passing through a portal into Antarctica. The verified priority is target selection under swarm pressure: clear the summoned small enemies first, then hit the glowing head weak point. The final fight is ammunition-rich, and chapter guides strongly recommend the rifle, especially with two attachments fitted. Phase divisions have not been verified, so this guide does not present a multi-phase script. Update 1.1.0 shortened the delay before a Slither weak point becomes hittable, which is a general Slither change, not a Slither Prime-specific rebalance statement.
4. Acheronian Juggernaut, mini-boss grade
The Acheronian Juggernaut is a giant fused from multiple bodies, with six arms and six legs and a mouth running from head to torso that can swallow a person whole, per the official Xbox blog. It is slow, but it turns any enclosed space into a positioning problem rather than a damage problem. The verified advice is to keep distance, use the space, and not trade blows head-on; its slowness is the main exploitable trait. Update 1.1.0 fixed several of its bugs, including getting stuck in A Sight for Sore Eyes, freezing all enemies after being hit by an explosive barrel, and standing on a fence ledge where the player could not hit it.
5. Shadow
Shadows twist space and test nerves, per the official store description, and defeating the Shadow ends the Holloway Manor quest and lifts its curse. In the main game, Shadows are also a recurring enemy presence. Update 1.1.0 fixed Shadow behaviors including a manor spawn point where it would not attack, idling and terrain and doorway snags in A Sight for Sore Eyes after being dispelled, and a grenade launcher failing to remove Shadow spikes. Specific Shadow weak points, phases, and positioning have not been verified, so this guide does not invent them.
6. Deep One Raider: an elite type, not a boss
The official PlayStation Blog introduces the Deep One Raider as an enemy type: a melee opponent of immense strength with devastating claw attacks, moving strangely, dodging inhumanly, dropping to all fours and suddenly charging to knock victims down. A fan summary suggests hitting the legs first, then the growths on the back. That is the extent of what is verified: there is no confirmed single Deep One boss fight with a phase script, so this guide lists it here as an elite enemy to respect, not as a boss to route. The same honesty applies to the Smasher, a fast, darkness-loving nightmare with human arms for legs: only its appearance and ambush style are verified, and no fan claim of boss status for it has a second source.
7. What 1.1.0 changed for big fights
Update 1.1.0 rebalanced four encounters by name, reduced enemy counts and waves in overwhelming fights, buffed grenade and gas-canister damage, made explosive props easier to spot with red lights, shortened the Slither weak-point delay, and reduced how often companion commentary triggers during boss fights. Those are encounter-level and system-level changes. The official note does not name Shoggoth or Slither Prime as individually changed, and this guide does not upgrade the four encounter names into four boss rebalances.
FAQ
How many bosses are there?
No official total exists. One review recalls two boss fights; a fan site lists four boss-tier encounters. This guide covers only verified names and does not claim the list is closed.
Why do headshots feel weak?
Because headshots are not the damage route here. Hit the glowing pustule-like weak points, and re-target them after they regrow.
Did 1.1.0 nerf Slither Prime?
Not as stated. The official note rebalanced four encounters by name and shortened the general Slither weak-point delay. It does not name Slither Prime as individually changed.

