Cursemark Boss Guide: All 3 Bosses in Early Access

The Cursemark boss guide exists because each of the three Early Access bosses does something the previous one doesn't prepare you for. Iron Bastard teaches you the interrupt window. Orsic forces add management. Lucian demands you identify the real enemy from its copies while dodging attacks that don't telegraph the same way the earlier fights do.

Clearing all three earns an Attunement Sigil from each, permanently unlocking three weapon styles for every future run. That's reason enough to push through even if one fight is stalling you. This Cursemark boss guide covers each fight in biome order with the verified weaknesses and mechanics.

TL;DR: Cursemark has three bosses in Early Access: Iron Bastard (fire weakness, interrupt-focused), Orsic (poison/rot weakness, add and pillar management), and Lucian the Fallen Prelate (Celestial weakness, mirror-image mechanics). Each drops an Attunement Sigil on first kill that permanently unlocks a weapon style. Beat them in biome order: Iron Bastard, then Orsic, then Lucian.

Cursemark boss guide: quick answer

The Cursemark boss guide short answer: three biome bosses in the current Early Access build. They gate progression in order: clearing Iron Bastard opens Biome 2 where Orsic waits, and clearing Orsic opens Biome 3 where Lucian waits. None of them are skippable. The Cursemark 1.0 roadmap targets seven biomes, so four more bosses are coming before full release, but the current three represent the complete EA content ceiling.

Every boss drops one Attunement Sigil on first kill. Sigils are permanent account unlocks, not run-specific items. Kill a boss once and the associated weapon style is available in the spell selection for every future run. That mechanic makes first-time boss kills more consequential than in most action roguelites.

Key takeaways

• Three bosses: Iron Bastard (Biome 1), Orsic (Biome 2), Lucian the Fallen Prelate (Biome 3)
• First kill drops an Attunement Sigil, permanently unlocking a weapon style
• Red-glow attacks are unblockable in all three fights; dodge, do not block
• Iron Bastard: fire weakness (1.5x), interrupt window at enrage (50% HP)
• Orsic: weak to Poison (1.5x) and Rot (1.3x), resistant to Celestial; conserve pillars for the 25% HP judgment slam
• Lucian: Celestial Bolt 2x weakness; attack mirror images without floor shadows
• 7 biomes planned for 1.0, so 4 more bosses are coming post-EA

Iron Bastard

Iron Bastard is the first boss and the most forgiving fight in Cursemark. The elemental weakness is fire. Embershot with any fire-rune synergy deals noticeably more damage than neutral spells in this fight, and the difference is visible quickly enough to confirm you're using the right loadout.

His primary combo is a three-hit slam with consistent rhythm: slam, short pause, slam, short pause, slam, long recovery. Count the hits out loud on your first attempt, and dodge toward the boss to close in on the recovery window, that's your punish opportunity. He also has a ground shockwave (jump or dodge it) and a charging grab (sidestep), plus a red-glow overhead slam that's unblockable, dodge through it rather than block.

At 50% HP he enrages. His attack speed doubles, which sounds worse than it is. The faster attacks are all interruptible in ways they weren't before, because the recovery frames shorten proportionally. A charged Divine Spear heavy will stagger him out of almost any animation during enrage. Charged spells become your best tool here, a level 3+ Embershot can kill him during the first enrage cycle without needing to dodge at all. First kill guarantees an Embershot rune.

Iron Bastard's arena in Biome 1. The rune sigils on the floor are decorative here but become interactive in Orsic's fight in Biome 2.

GODEEPER: The rune combinations that clear Iron Bastard and scale into the later biomes. Cursemark Roguelite Runes, Builds and Early Access Launch →

Orsic

Orsic's fight tests your add management and your arena awareness. His attacks include a 4-hit sword slash combo (blockable except the final hit), a holy bolt volley (strafe to avoid it, don't block), and summoned adds at fixed 66% and 33% HP thresholds, not continuously. Orsic will deliberately target the arena's four pillars with his sword combos, so bait his attacks away from them when you can.

At 25% HP, Orsic triggers a judgment slam that covers the entire floor. Each pillar blocks exactly one slam. Destroyed pillars do not respawn, which means if you've been using pillars as cover throughout the fight, you might arrive at the 25% transition with fewer than four still standing.

So take damage from normal attacks earlier in the fight rather than tank Orsic's add waves behind a pillar. Save at least one pillar for the 25% slam. Two is safer.

Orsic is weak to Poison (1.5x) and Rot (1.3x), and resistant to Celestial (0.5x). Poison Cloud is the standout rune for this fight: the adds he summons leave toxic clouds on death that damage Orsic, and if you're also running Embershot, those clouds ignite into burning pyres for extra passive damage. Some players temporarily respec toward a Pyre Lord build just for this fight. The Cursemark tips guide covers the rune combos that work well against add-heavy encounters.

Lucian the Fallen Prelate

Lucian is the current endgame challenge and the hardest fight in Early Access Cursemark. He's weak to Celestial (2x) and Fire (1.3x), and resistant to Rot (immune) and Poison (0.5x). Celestial Bolt is close to mandatory here: it deals double damage, and if you're running Purification synergy it also clears the rot damage-over-time Lucian constantly stacks on you.

Lucian summons mirror images of himself during the fight. The tell is simple once you know it: the real Lucian casts a floor shadow. Mirror images don't. Attack the copies without shadows until they collapse, and don't waste spells on the shadowed one.

A Voltara cast with Ice Trail active can hit multiple images simultaneously due to the spread. If Ice Trail is in your build, the mirror phase goes a lot faster.

He also teleports, and the sound cue comes about half a second before the animation. Dodge on the audio, not the visual. Players who wait for the wind-up miss it consistently because the telegraph is short on purpose.

His red-glow attacks are unblockable like the other bosses. Dodge through them rather than around them; the hitbox trails the visual.

GODEEPER: How the sigil system connects to long-term build variety once you've cleared all three EA bosses. Cursemark Secrets and Sigils Guide: All Unlocks →

The Cursemark HUD in a live EA run. The rune icons on the right track your active build synergies. Bring at least one lightning rune into Biome 3 for Lucian.

After the bosses: Attunement Sigils and what they unlock

Each boss drops one Attunement Sigil on first kill. The sigils are permanent account unlocks, not run items:

• Iron Bastard's sigil unlocks a weapon style available in all future spell selections
• Orsic's sigil unlocks a second weapon style
• Lucian's sigil unlocks the third weapon style

The full weapon unlock picture isn't confirmed pre-1.0, but the EA pattern is consistent: first-kill rewards expand your build options permanently rather than providing a one-run spike. Killing a boss again in later runs doesn't drop a second sigil. This Cursemark boss guide will update when 1.0 adds the remaining four biome bosses. For the current build state and how sigils interact with rune crafting, the Cursemark review covers what the EA experience delivers and what's still missing.

Frequently Asked Questions

How many bosses are in Cursemark Early Access? Three: Iron Bastard (Biome 1), Orsic (Biome 2), and Lucian the Fallen Prelate (Biome 3). Cursemark's 1.0 roadmap targets seven biomes total, so the full release will add four more boss encounters beyond what's currently playable.

What do Attunement Sigils do in Cursemark? Each boss drops one Attunement Sigil on first kill. That sigil permanently unlocks a specific weapon style available in all future runs, regardless of which spells you start with. Killing all three EA bosses unlocks three weapon variants for permanent use.

What is Iron Bastard weak to in Cursemark? Fire. Iron Bastard has no fire resistance in its first phase. Embershot with any fire-rune synergy deals noticeably more damage than neutral spells. His enrage at 50% HP doubles attack speed but makes every attack interruptible by charged heavy hits.

What is Lucian the Fallen Prelate weak to? Celestial, specifically Celestial Bolt which hits at 2x effectiveness (Fire is a secondary 1.3x weakness). Lucian summons mirror images during his fight; attack the copies without floor shadows, not the shadowed one. A single Voltara cast with Ice Trail active can hit multiple mirrors simultaneously.

Is there a Cursemark boss order? Yes, bosses gate biome progression. Iron Bastard must be cleared to access Biome 2 and Orsic. Orsic must be cleared to reach Lucian in Biome 3. The fights scale in difficulty and the Orsic fight specifically requires managing arena pillars that don't respawn once destroyed.

Related Reading

• Cursemark Review 2026: full assessment of the Early Access build, covering what works and where the content currently runs thin
• Cursemark Tips: 10 Things to Know Before Your First Run: pre-boss essentials on rune crafting, spell selection, and resource management
• Cursemark Roguelite Runes, Builds and Early Access Launch: the build guide for fire, lightning, and hybrid rune paths that scale into the late biomes
• Cursemark Secrets and Sigils Guide: how Attunement Sigils unlock into the broader secrets system and what to unlock in what order

References

• Cursemark on Steam: official store page with current EA patch notes and developer announcements
• Cursemark All Bosses Guide: Attack Patterns, Weaknesses, Rewards: detailed boss mechanics sourced from community testing
• Cursemark Wiki: Complete Early Access Guide: community-maintained wiki with roster and sigil documentation