Dosei, the Giant Claw ✓ corroborated

Kill achievement: OUT-SLASHED — currently unlocked by 19.6% of players (Steam global stats, updated July 26, 2026).

Confirmed by two independent 100%-completion players. A third player describes this giant bird as the hardest fight up to that point: a Malenia-style string in phase two that demands pixel-perfect parries — miss it and you lose on the spot.

Strategy

Phase two has a fast multi-hit string that punishes a single missed parry — players compare it to Malenia. Expect to learn the rhythm over several attempts; the fight is a wall by design. community-reported

Source: u/Due-Bookkeeper-2001, launch-week boss discussion

Bring Tank as your summon: Tank's special grants healing on block, and because Dosei attacks many times quickly, every missed parry can be recovered by holding block and healing through the string. community-reported

Source: u/SageFlare, replying to our checkpoint thread

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.