01Weapon Damage / DexterityPrimary scaling. An item-level upgrade that raises these almost always beats any substat arrangement.
02Critical HitThe apex substat. It scales quadratically — raising both how often you crit and how hard — which is exactly what the Devilment window wants. Maximise it on every piece and every materia slot.
03DeterminationA linear multiplier on all damage and healing, including your Curing Waltz.
04Direct HitMeld only once Critical Hit is capped on the piece and Determination thresholds are met.
05Skill Speed — avoidIt speeds the GCD without speeding dance recasts or procs, misaligning the 120-second cycle and clipping cooldowns. Since Tillana was normalised there is no longer any breakpoint to chase.