From Pathfinder Impossible Magic, which isn't enabled.

Widow’s Bite

SPELL 3

Traditions arcane, primal

Cast

Range touch

Targets 1 creature

You conjure up a deadly stinger on your hand and stab a foe. Make a melee spell attack against the target's AC. On a hit, the target takes 1d4 piercing damage and 3d4 persistent poison damage (or double damage on a critical hit). Additionally, the target is Enfeebled 1 until it removes the persistent poison damage.

Heightened (+2) The initial piercing damage increases by 1d4, and the persistent poison damage increases by 2d4.

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