ultimate

Muramasa

The cursed blade — ruinous spirits ravage everything around you

magic (MA x Faith, mitigated by MDEF)

Job: Samurai
MP cost: 24
Charge: 2 CT — the caster is out of the turn order until it lands
Power: 32
Range: Self-centred
Area: self-centred diamond r2 (caster exempt)
Targets: anyone in the area
Accuracy: 100%
JP to learn: 550
Element: dark

Rolling it

Nothing is guaranteed. At the start of each battle a unit's primary job rolls every ability it knows, one at a time.

As your primary job: 10%
As a sub-job draw: 1% of the bucket

Roughly one unit in 150 skips the roll entirely and fields its whole catalogue. If a unit rolls nothing at all, it is granted its cheapest ability rather than being sent out empty-handed.