common

Nightshade

Single-target poison curse — slow HP drain over time

Job: Cursebrand
MP cost: 14
Charge: Instant
Power: —
Range: 4 tiles
Area: single tile
Targets: enemy
Accuracy: sqrt(caster Faith x target Faith) + caster MA
JP to learn: 260
Element: dark Flavour only — this ability deals no damage, so no elemental check ever runs.
Applies: Poison — 2 turns

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: 75%
As a sub-job draw: 60% 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.