Akai Tsuki ✓ corroborated
Kill achievement: BREAK THE SPIRIT, CLAIM THE STEEL — currently unlocked by 13.1% of players (Steam global stats, updated August 4, 2026).
The secret boss — two independent 100%-completion players pin him to BREAK THE SPIRIT, CLAIM THE STEEL, and "claim the steel" matches the Akai Chainbound blade named in launch reviews. His second phase is the current "cannot beat" hot spot: players call it "way too fast" and say it barely leaves room to heal.
Strategy
Players who cleared phase two recommend: put roughly 70/30 of your stat points into attack/health, use a greatsword (critical hits on every deflect), and save a freezing summon to stun him for a full light-light-light → heavy-heavy punish window. community-reported
Source: Steam discussion 'Cannot beat boss' — strategies aggregated from the replies
A summon that heals you on parry is repeatedly recommended for this fight, and watch his reach on every third or fourth attack — that is the string players say catches them. community-reported
Source: Steam discussion 'Cannot beat boss' replies; an 'Akai bug' thread also exists — see the bugs page
The Tank summon (healing on block) is the community's other go-to here — but it only carries you so far: phase one still demands real parries. ✓ corroborated
Source: Two independent Reddit replies recommend the Tank summon for this fight (u/Glass3544 and u/SageFlare, the latter for Dosei with the same reasoning)
Why phase two feels unreadable: Akai Tsuki shrinks in his second phase and the particle effects bury his wind-ups. Players calling him "the hardest fight in the game by a landslide" point at exactly this — it is a visibility problem as much as a timing one, so position the camera wide before the phase flips. community-reported
Source: u/Playful-sink-9074, launch-week Reddit replies
Core mechanics that matter here
- Deflect / parry — timed blocks that build the boss’s Resolve Bar. ✓ corroborated
- Instinct Counter — the heavy counterattack available when the Resolve Bar is full after perfect parries. ✓ corroborated
- Soul Arts & Boss SP — upgrades bought with SP earned from bosses; the Meteor Slice / Dash / Zone lines each have max-upgrade achievements. ✓ Steam-verified
- Ghost Summons — defeated bosses can be unlocked as summons with passive perks. ✓ corroborated
Found something wrong, or beat this fight with a different setup? Send it in — corrections ship same-day and reports are credited.