From Pathfinder Rage of Elements, which isn't enabled.

Brine Dragon Bile

SPELL 2

Traditions arcane, primal

Cast

Range 30 feet

Targets the creature that took damage

Trigger A creature within range takes damage from a slashing or piercing attack, or one that inflicts persistent bleed damage.

You spit a glob of caustic saltwater that stings the wounds of the creature. Make a ranged spell attack against the triggering creature's AC. On a hit, salt scours its open wound, dealing 2d6 persistent acid damage.

Heightened (+2) The persistent damage increases by 2d6.

Pathfinder Rage of ElementsOGL