Final preparation
The Beast of Reincarnation is the final campaign boss and this guide contains full spoilers by design. Enter only after upgrading the weapon and defensive equipment you actually use, spending available skill points, refilling healing, and restocking ranged ammunition. No reliable source currently confirms one elemental weakness, so the Monster Index shows Not yet verified and the strategy does not manufacture a recommendation.
Choose a compact punish skill, a control or stagger-supporting Koo command, and any passive options that improve survival or entanglement efficiency. The fight tests resource pacing across phases. Arriving with maximum damage but insufficient healing or unfamiliar timing is less useful than a stable build that can repeat the opening without losses.
Learn each phase separately
Treat every phase as a new rhythm. Begin defensively and identify the complete attack sequences before attempting long counters. Determine which actions end with a visible recovery and which merely pause before continuing. Use one short response after a confirmed ending, then return to defense. Do not carry parry or dodge timing from the previous phase into a new animation without testing it.
When the arena becomes visually crowded, move toward open ground and restore the camera before attacking. Effects can hide the start of a major action. Losing one damage window is acceptable; losing sight of the boss while committed to a skill is not. Ranged attacks can maintain modest pressure during the reset, but stop aiming as soon as a new sequence begins.
Resource and stagger management
Keep enough FP, healing, and ammunition for later phases. Do not spend every Koo command during the opening simply because the first entanglement is available. A command is most valuable after a successful defense or an unmistakable recovery, when it extends a real window instead of trying to interrupt unknown behavior.
Entanglement Overdrive and the longest sword skill should be reserved for a staggered state or the completion of a major attack. Outside those openings, one compact punish is safer. If the down gauge is close to breaking, prioritize consistent actions that finish the stagger instead of gambling on a slow animation. Once the boss is down, spend damage decisively and disengage before the recovery completes.
How to stabilize a late attempt
If you reach a later phase with too few resources, the correction belongs in the earlier phases: shorten punishes, heal only after confirmed recoveries, and use fewer projectiles when neutral damage would suffice. If you are repeatedly hit during transitions, stop attacking as the health threshold approaches and enter the change with full camera control.
The reliable final-boss mindset is observation before commitment. See the whole sequence, defend it, answer once, and reset. Build aggression only after the current phase is understood. The unknown weakness and reward fields remain visible as Not yet verified until English UI or another reliable released-game record confirms them; uncertainty is not filled with a convenient guess.
Before retrying, decide which phase needs practice and protect resources until you reach it. If an early phase is already consistent, use the shortest proven responses there and avoid experimenting. Save unfamiliar skills for a separate practice attempt rather than introducing them during a promising run. When healing is required, wait for a recovery you can name instead of reacting only to low health. When Koo is available, use the command to extend control after defense, not to cover a panic attack. This deliberate pacing turns the final encounter into a series of learned exchanges rather than one long, visually overwhelming test.
Use the same review method after every defeat: identify the phase, the attack that landed, and whether the cause was timing, camera loss, resource shortage, or an overlong punish. Change one factor on the next run. A specific diagnosis produces progress; replacing the entire build after every attempt does not.