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Kernel Hearts bosses are preparation gates, not reflex tests. Each one wants a specific element (doubled damage), a specific chip loadout, and reads like a checklist: earn the summon item from a quest or craft, telegraphed patterns you can count, and a recovery window that is the only real damage phase. Bring the right chips and half the fight happens before the first swing.

• Check the boss attunement — the opposite element doubles your damage.
• Bring more healing items than feel necessary; boss fights are long.
• Learn the pattern count (sweeps come in threes, floods in cycles) and punish only the last one.
• If the fight feels impossible, it is a gear check — leave and upgrade your chips, the boss does not decay.