F.F.
Plankton colony bound to a corpse. Six-skill rotation.
Difficulty scaling
Engine-side ATK is a sentinel — damage flows through crit boost. Each tier ratchets crit until Hell locks in a ×2.5 multiplier on every swing.
Normal
Mon #536100116 skill IDs
6100100, 6100111, 6100121, 6100131, 6100141, 6100151 Advanced
Mon #536100126 skill IDs
6100100, 6100112, 6100122, 6100132, 6100142, 6100152 Difficult
Mon #536100136 skill IDs
6100100, 6100113, 6100123, 6100133, 6100143, 6100153 Nightmare
Mon #536100146 skill IDs
6100100, 6100114, 6100124, 6100134, 6100144, 6100154 Hell
Mon #536100156 skill IDs
6100100, 6100115, 6100125, 6100135, 6100145, 6100155 Lore & design notes
F.F. is the outlier of the Infinity roster: instead of the 999,999,999 ATK sentinel, the boss carries a real numeric atk_flat of 5,000,000 at every tier and runs a 6-skill rotation (every other Infinity boss has 4 or 5). That means F.F.'s damage actually scales from the ATK stat, not just the crit multiplier — which makes high-single-burst counter-teams strictly better than sustained DPS here.
Counter team
High-burst Stone Ocean lineup
Lineup
- Jolyne Cujoh — Stone Free string-burst main DPS
- Ermes Costello — Kiss damage-amp via doubling
- Weather Report — large AoE / single-target finisher
Why it works
F.F.'s real ATK means slow damage-over-time wastes burst windows. You want one massive multiplied hit. Ermes's Kiss doubling stacks on top of Jolyne's burst to clear a Hell phase in a single rotation.
Watch out
Six skills means F.F. has the longest skill queue of any Infinity boss. Bring at least one cleanse for the plankton DoT or your front line will rot through the third skill cycle.