Ars Goetia's dark fantasy dungeon crawler released on 26 May 2022 through Dear Villagers, and it asks you to pick which of six demons your character serves before the first fight. That pact is the class system: Lucifer, Beelzebub, Baal, Satan, Asmodeus and Leviathan each hand you a different skill tree, different stat growth per level and a different Demon Form. Combat is turn based on a fatigue clock rather than a strict you go, I go order, so cheap actions can chain before an enemy ever moves.
Boss fights are where Hellslave tests everything you've learned. This guide covers strategies for bosses across all areas, organized by progression order. For general combat techniques, see our combat guide.
Boss Difficulty Overview
| Area | Difficulty | Recommended Build | Key Equipment |
|---|---|---|---|
| Byleth | Easy | Beelzebub | Apocalyptic Choreography |
| Synok | Moderate | Beelzebub | Apocalyptic Choreography |
| Tomb of Heroes | Hard | Lucifer | Balam's Strike |
| Troglodyte City | Very Hard | Lucifer | Balam's Strike |
| Lair of Zarrak | Extreme | Lucifer | Balam's Strike |
Byleth Bosses
Area difficulty: Easy Recommended level: Opening act Recommended build: Beelzebub with Apocalyptic Choreography
Strategy
The first bosses teach core combat mechanics. Focus on learning patterns rather than dealing damage. You pledge to one of six demons at the start, and that choice sets your stat growth, your Demon Form and your entire skill tree. This is your primary tool here.
Key tips:
- Don't rush. Learn the attack patterns first.
- Use Demonic pact instead of a class to create safe windows.
- Apocalyptic Choreography is enough to handle everything here.
Synok Bosses
Area difficulty: Moderate Recommended level: Second half of the campaign Recommended build: Beelzebub with Apocalyptic Choreography
Strategy
Early game bosses test your understanding of Fatigue clock turn order. Players who skipped learning this mechanic will hit a wall here.
Key tips:
- Fatigue clock turn order is critical for these fights.
- Farm Apocalyptic Choreography upgrades if you're struggling.
- Consider switching to Beelzebub if your current setup isn't working.
Tomb of Heroes Bosses
Area difficulty: Hard Recommended level: Early game, before Demon Form is reliable Recommended build: Lucifer with Balam's Strike
Strategy
Mid-game bosses are the major skill check. They combine multiple mechanics and punish players who rely on a single strategy.
Key tips:
- You need both Demonic pact instead of a class and Momentums and Postures mastery.
- Balam's Strike makes a significant difference. Get it before attempting these.
- See our combat guide for advanced techniques.
Troglodyte City Bosses
Area difficulty: Very Hard Recommended level: Mid to late campaign Recommended build: Lucifer with Balam's Strike
Strategy
Late-game bosses are serious challenges. Build optimization matters as much as mechanical skill.
Key tips:
- Make sure your build is fully optimized.
- Balam's Strike at max upgrade is recommended.
- Study each boss's attack patterns. Most have 2-3 phases.
Lair of Zarrak Bosses
Area difficulty: Extreme Recommended level: Late campaign Recommended build: Lucifer with Balam's Strike
Strategy
Endgame bosses are the ultimate test. They require mastery of all combat systems and an optimized build.
Key tips:
- Top-tier build with best-in-slot gear is mandatory.
- Master every mechanic. See our combat guide.
- These fights reward patience and pattern recognition above all else.
General Boss Tips
- Learn before you fight: Spend your first attempt observing attack patterns. Don't try to win on attempt one.
- Match your build: Some bosses favor certain builds over others. Don't be afraid to switch.
- Upgrade your equipment: A max-upgraded Balam's Strike trivializes fights that seem impossible with weaker gear.
- Use Demonic pact instead of a class: The core combat mechanic is your best defensive tool in every boss fight.
- Check the walkthrough: Our walkthrough tells you when you're ready for each boss.
More Hellslave Guides
- Hellslave Hellslave Overview
- Hellslave Best Builds
- Hellslave Tier List
- Hellslave Walkthrough
- Hellslave Beginner's Guide
- Hellslave Tips & Tricks
- Hellslave Weapons Guide
- Hellslave Combat Guide
- Hellslave Maps & Locations
- Hellslave Crafting Guide
- Hellslave Classes & Characters
Similar Games
If you enjoy Hellslave, check out these related guides:
- Elden Ring Boss Guide: rpg game with similar mechanics
- Baldur's Gate 3 Boss Guide: rpg game with similar mechanics
- Cyberpunk 2077 Boss Guide: rpg game with similar mechanics
