Pako Battiliar sends a swarm of bats flying in a straight line. Each individual bat has its own hit detection, so the more enemies are lined up along the swarm's path, the higher the total hit count. The swarm spawns at random positions on the field. Additionally, the weapon may retaliate when the player loses health, sending out an extra bat burst when damage is taken.

• Each bat in the swarm independently hits enemies along its flight path
• Spawn position is random — positioning near dense enemy clusters maximizes hit count
• Taking damage may trigger a retaliation swarm burst
• Hollow Heart raises MaxHP, making it easier to absorb hits and trigger retaliation more frequently

Hold Hollow Heart, level Pako Battiliar to MAX, then open a treasure chest after 10:00 (evolved form name to be confirmed).

Hollow Heart also raises MaxHP, so taking it as an evolution material simultaneously improves survivability.

• Individual hit detection per bat means dense enemy clusters receive multiplicative total damage
• Retaliation mechanic converts incoming damage into offensive output
• Hollow Heart investment builds both the evolution requirement and the HP buffer for retaliation play
• Spinach (Might) applies to each individual bat, compounding with swarm density

• Unlocking requires 161,616 cumulative bat kills — one of the most demanding unlock conditions in the game
• Random spawn position means some swarms will fire into empty space
• Retaliation may be probabilistic — not every hit taken guarantees a retaliation burst
• Sparse enemy formations significantly reduce total hit count per swarm

Select stages with high bat density to efficiently work toward the 161,616 kill unlock. After unlocking, characters who can sustain heavy damage or who benefit from high MaxHP synergize well — they can deliberately absorb hits to trigger retaliation more frequently while maintaining survivability.

The 161,616 cumulative bat kill requirement should be treated as a long-term goal — pick stages where bats appear frequently and progress the counter across many runs. There is no need to attempt it in a single run.

After unlocking, use Attractorb and Area bonuses to keep enemies clustered near the player. Since swarm spawn positions are random, denser enemy formations around the player means any spawn location is likely to produce high hit counts.

For a retaliation-focused build, pair Hollow Heart and Pummarola to create a high-MaxHP, regenerating baseline that lets you absorb hits deliberately without danger — then let the retaliation bursts do extra work.

Q. Do the 161,616 kills need to happen in a single run? A. No — this is a cumulative counter across all runs. Picking bat-heavy stages and running them repeatedly is the most efficient approach.

Q. When does the retaliation trigger? A. An additional bat burst fires when the player takes damage, with a potential random chance. Higher MaxHP provides more room to absorb damage and trigger retaliation more often.

Q. Should I take multiple Hollow Hearts? A. One is required for evolution. Additional copies continue raising MaxHP, which benefits the retaliation-focused playstyle by providing more room to absorb hits safely.