Boss list / strategy hub

Fatal Claw Bosses

Start with the confirmed boss roster, then use boss order, progression role, and quick links to find the route blocker. Detailed attack patterns stay below the roster until a 1.0 guide, Steam discussion, or video segment confirms the fight.

Quick Answer

The confirmed Fatal Claw boss roster currently includes Saitin, Mirkam, Irbes, Ortrinde, Sommar, Cain, and Sorron from Steam achievements. Kurtz is tracked on this hub as the current late-route stuck point because players are searching around Black Mire, blink timing, shield phases, and Cain progression.

For Kurtz searches, split the problem first: if you are stuck outside the route or at a locked door, use the map, abilities, and walkthrough checks; if you are already in the arena, use the Kurtz row below for blink, shield, Cain, and fight-state troubleshooting.

v1.0.54 Boss and Map Updates

The v1.0.54 hotfix adds boss map markers and continues freshness adjustments for several late-route bosses. If you are looking for a boss location or rechecking a fight after the patch, start with the Fatal Claw map hub and the boss rows below instead of relying on older route notes.

Update	What it means for boss routing
Boss map markers	v1.0.54 adds map marker context for certain bosses and locations. Use the map hub to check whether a missing boss is actually a visibility or route-access problem before treating it as a bug.
Difficulty adjustments	Kurtz, Odz, Murant, and Sorron continue to have freshness signals after v1.0.54. Treat pre-1.0.54 arena advice as needing a recheck, not as proof of changed HP, damage, phase count, weakness, or rewards.
Fusion skill and location markers	v1.0.54 also improves fusion-skill-related map visibility. Pair boss route questions with the fusion skills guide and the map hub before re-attempting older recipes or routes.

Boss Quick Table

Boss	Location	Weakness	Strategy	Reward / recommended fusion
Kurtz	Black Mire / late-route search cluster / v1.0.38 difficulty adjusted	No verified elemental weakness published here yet.	Separate route access from arena execution: confirm the Black Mire path, then watch blink timing and shield-state openings instead of forcing damage.	Use a reliable survivability or counter-focused fusion; do not spend 100 Kannic on unverified boss-only recipes.
Cain	Late-route duel	No verified elemental weakness published here yet.	Treat Cain as a duel check: keep spacing stable, punish after committed attacks, and avoid changing fusion loadout mid-attempt unless the failure point is clear.	Recommended fusion remains evidence-limited; bring a tested setup you can trigger consistently under pressure.
Sorron	Late ambition / archive search cluster / v1.0.38 difficulty adjusted	No verified elemental weakness published here yet.	Use the boss-order page and achievement route notes before assuming Sorron is only a fight-location problem.	Keep Sorron advice spoiler-light until direct 1.0 route captures confirm the exact archive chain.
Ordo / Ord	Current player-query spelling cluster	Not treated as a verified boss weakness target here.	Use this row as a spelling and route-intent catch: if the search means saving Ord or Ordo, check late-route Cain and Sorron dependencies instead of boss mechanics.	Needs direct 1.0 evidence before becoming a standalone guide.

Recent Boss Balance Changes

The latest boss-specific freshness signal is v1.0.38: Kurtz, Odz, Murant, and Sorron are marked difficulty adjusted. The older v1.0.27 area-difficulty adjustment is still useful for routing near affected regions, but neither note is evidence for a specific boss HP, weakness, damage, phase, or reward change.

Freshness note	Safe interpretation
v1.0.38 boss difficulty adjusted	Kurtz, Odz, Murant, and Sorron are specifically marked as difficulty adjusted. Treat that as a freshness warning for older strategy notes, not as proof of changed HP, damage, phase count, weakness, or rewards.
v1.0.27 freshness check	The verified patch note adjusts difficulty in Black Canyon, Strigine Quarry, Elord Castle, Higasha Tundra, Kannir Belt, and Aphotic Marsh.
How to use it	If a boss tip was written before September 2, 2026, recheck route advice in those areas before trusting older difficulty or arena-pressure notes.
What this does not claim	The patch note names areas, not specific boss HP, weakness, phase, or reward changes. This hub will not turn those area notes into boss-specific facts.

Featured Boss Guides

KurtzLate-route stuck point around Black Mire, shield-state questions, blink checks, Cain progress, and ending cleanup.CainConfirmed duel achievement and late-route dependency cluster; use route state before changing builds.SorronLate ambition and archive-search cluster; check ending state, Archive progress, and boss-order context.Ordo / OrdPlayer-query spelling cluster tied to late-route save questions; keep it as a next-step lookup until direct evidence supports a page.

Boss Roster

Boss	Progression role	Known objective	Achievement / route link	Status
Saitin	Early confirmed boss	Defeat Saitin.	Weed Control	Confirmed by Steam achievement
Mirkam	Village power route	Defeat Mirkam and restore power to the village.	Let There Be Light	Confirmed by Steam achievement
Irbes	Combat wall	Defeat Irbes.	Too Slow...	Confirmed by Steam achievement
Ortrinde	Mid-route boss	Defeat Ortrinde.	Pull Yourself Together	Confirmed by Steam achievement
Sommar	Calling route boss	Defeat Sommar.	Fulfill the Calling	Confirmed by Steam achievement
Cain	Duel / late route	Defeat Cain in a duel.	Faster Than Lightning	Confirmed by Steam achievement
Sorron	Late ambition route / v1.0.38 adjusted	Defeat Sorron and end his ambitions.	The End of the Illusion	Confirmed by Steam achievement; v1.0.38 difficulty adjusted
Kurtz	Black Mire / White Spirit report / v1.0.38 adjusted	Players are actively asking about blink timing, shield phases, Cain, and route access; v1.0.38 marks Kurtz difficulty adjusted.	Late route / Cain progression	Launch-week demand; v1.0.38 difficulty adjusted

Boss Order Summary

For sequence questions, use the Fatal Claw Boss Order page. Keep the broad progression scaffold here: early route bosses lead into mid-route bosses, then late-route duel, archive, and cleanup checks.

Progression Role

Early routeSaitin, Mirkam, and Irbes are safe first-pass entries because Steam achievement text identifies the defeats directly.Mid-routeOrtrinde and Sommar should stay tied to progression role until matching room-level route evidence is verified.Late routeCain and Sorron stay spoiler-labeled because their achievement wording points into late story and ending cleanup.Current stuck pointKurtz is tracked as a late-route demand cluster around Black Mire, blink timing, shield questions, Cain, and route access. v1.0.38 marks Kurtz difficulty adjusted, so older arena advice needs rechecking.v1.0.38 boss noteKurtz, Odz, Murant, and Sorron have a difficulty adjusted freshness note. This hub keeps that label separate from unverified mechanics or stat changes.v1.0.27 difficulty noteThe hotfix adjusted difficulty in Black Canyon, Strigine Quarry, Elord Castle, Higasha Tundra, Kannir Belt, and Aphotic Marsh. Recheck recent route notes when using older boss advice tied to those areas.

Quick Links

Boss OrderProgression sequence and route role without copying the full walkthrough.Full WalkthroughArea route order from Origin Laboratory through postgame cleanup.Fatal Claw MapRegion, gate, fast-travel, and boss-location context.AbilitiesWater, claw, blue barrier, sanctuary, and corruption blockers.

Pending Strategy Evidence

The boss hub does not add unverified HP totals, weakness lists, damage values, or phase counts. Those details should move into individual boss pages only after direct 1.0 evidence supports them.

Area or route context.
Required ability, claw upgrade, or story state.
Main attack telegraph and safe punish window.
Reward, gate opened, or achievement connection.
Patch or player-report freshness note.

Open the Steam source or read the v1.0.27 patch note, check recent patch notes, then check the achievement list.