Boss battles in Deep Sleep: Labyrinth of the Forsaken are some of the most intense moments in the game. While the core combat system may look overwhelming at first, the truth is: every fight becomes manageable once you understand how to pace your attacks, apply bleeding correctly, and control enemy turns through stuns and slows.
This Deep Sleep Labyrinth of the Forsaken Bosses Guide breaks down optional weapons you should unlock, core skills to invest in, and detailed strategies for each major boss type.
Optional Weapons (Highly Recommended)
These weapons drop from optional bosses and can make fights far easier, though none are strictly required to finish the game. Here’s where to find them:
- Revolver – Found after repeating The Hotel and taking the elevator up. Defeat the optional boss to claim it.
- Doll House Weapon – Insert a coin into the capsule toy dispenser near BERT!, then use the toy capsule key to open the nearby door. Interact with the mirror to start the fight and win the weapon.
- Cave Weapon – Locate the locked area inside the Cave. Cut through the locks with bolt cutters (two interactions needed) and defeat the optional boss.
Core Skills & General Tips
- Reset Skills Daily – Use the fridge to respec once per day. Tailor your build for the upcoming boss.
- Focus on Damage – Don’t waste turns blocking or over-healing unless absolutely necessary. Bosses fall quicker when pressured.
- Bleeding Management – Avoid overstacking bleed (e.g., don’t dump 15 stacks too early, they won’t tick long enough). Apply it steadily.
- Stun Synergy – Always stun after applying bleed, so damage ticks while enemies are helpless.
- Craft Beforehand – Plan your loadout so you don’t have to waste turns crafting mid-fight.
- Use Slow Wisely – Against single targets, combine slow with bleed for maximum damage over time.
Boss Strategies
1. Single-Target Bosses
These are the simplest fights. The aim is to chain stuns and bleed until they collapse.
Best Weapons:
- Pickaxe (2 damage + 1 bleed, 3 focus)
- Nailed Plank (1 damage + 1 bleed, 2 focus)
- Spider’s Fang (7 bleed + 1 haste, 2 focus) – incredible value
- Wrench (1 damage + 1 slow, 3 focus)
- Camera (AoE slow, 4 focus, weaker than wrench but useful)
- Human Bone (cheap raw damage, 1 focus)
Best Skills:
- Precise Hit – Boosts raw damage output.
- Stunning Strike – Extends stun duration.
- Sharp Mind – Craft for 1 less focus.
- Double Vision – Doubles crafted charges.
- Coffee Addict – Expands total focus pool.
Strategy Loop:
- Open with Spider’s Fang to apply massive bleed.
- Rotate between Wrench for stun/slow and raw damage tools like Bone or Pickaxe.
- Keep bleed active at all times.
2. The Sirens (Triple Boss Encounter)
The Sirens are tricky because they heal each other. You can either eliminate one at a time or cleave them all down together. The second method is faster if you build for it.
Best Weapons (Cleave Build):
- Metal Pipe (damage + cleave, 2 focus)
- Cleaver (damage + cleave + bleed, 3 focus)
- Rusty Axe (2 damage + cleave + 2 bleed, 4 focus)
- Camera (great for AoE stun)
Best Skills:
- Stunning Strike – Extra stun duration.
- Wide Swing – Boosts cleave damage.
- Sharp Mind – Cheaper crafting.
- Double Vision – Efficient supply generation.
- Coffee Addict – More focus pool.
Strategy Loop:
- Open with a stun (Camera) to freeze the group.
- Rotate cleave weapons to damage and bleed all at once.
- Keep their healing in check by ensuring constant AoE pressure.
3. Puppet Master / Spider Queen
These bosses spawn minions throughout the fight. The trick is balancing minion control while keeping bleed damage ticking on the main boss.
Best Weapons:
- Pickaxe & Nailed Plank – Reliable bleed and damage.
- Spider’s Fang – Best single-target bleed tool.
- Wrench – Slows boss and minions.
- Camera – AoE stun utility.
- Cleave weapons – Optional, can speed up minion clears.
Best Skills:
- Precise Hit – Raw power scaling.
- Stunning Strike – Keep bosses and spawns locked down.
- Sharp Mind – Efficient crafting.
- Double Vision – Stockpile resources.
- Wide Swing – Helps handle waves of adds.
Strategy Loop:
- Open with Spider’s Fang to bleed the main boss.
- Focus minions as soon as they appear—don’t let them pile up.
- Between waves, chain stuns and stack damage on the main target.
Future Bosses
Later bosses don’t introduce completely new mechanics—just tougher numbers and variations. By this point, you’ll have more echoes, better weapons, and experience with the game’s combat rhythm. Stick to the same principles: bleed, stun, and manage focus efficiently.
If things feel overwhelming, remember you can always farm echoes in the Forest to strengthen your build before trying again. With future patches adding difficulty settings, some of these encounters will naturally feel more forgiving.
The combat in Labyrinth of the Forsaken rewards planning and tempo control rather than brute force. Once you embrace stun-locking and bleed synergy, bosses that looked intimidating at first will start to fall apart quickly.
Good luck on your runs—stay sharp, plan your skills around each fight, and don’t be afraid to reset until you find the build that clicks.