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From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Alghollthu Whip

ITEM 7
UNCOMMONDISARMFINESSENONLETHALREACHTRIP
Price 350 gp
Usage held in 1 hand
Bulk 1
Category martial
Group flail
Damage 1d4 slashing

This fleshy +1 striking whip is obviously crafted from the tentacle of some fearsome beast, likely an aqudel, and constantly strobes with small patterns of light.

Activate (concentrate, occult, visual)
Frequency once per day
Requirements Your last action was a successful Strike, Grapple, or Trip with the alghollthu whip
Effect Patterns on the skin of the whip strobe in a rapid pulse. The creature your attack succeeded against must attempt a DC 23 Will save.

Critical Success The target is unaffected.

Success The target is Dazzled until the end of your next turn.

Failure The target is dazzled until the end of your next turn and Stunned 1.

Critical Failure The target is dazzled until the end of your next turn and Stunned 2.

Craft Requirements The initial raw materials must include a tentacle from an aqudel.
Pathfinder Treasure Vault (Remastered)ORC