pf2e.fyi
From Pathfinder Adventure: The Slithering, which isn't enabled.

Slime Whip

ITEM 7
Price 360 gp
Usage held in 1 hand
Bulk 1
Category martial
Group flail
Damage 1d4 slashing

This thick, greasy +1 striking Shifting whip is made from a slimy pseudopod. You don't take the usual -2 circumstance penalty to your attack rolls when using the slime whip to make a lethal attack. The whip's form can be changed just like any weapon with the shifting rune, but it reverts to its original form as soon as it isn't wielded. When in its whip form, you can use the following action.


Activate command, Interact
Frequency once per hour

Effect For 1 round, the slime whip deals acid damage rather than slashing damage. If the attack deals persistent damage, the persistent damage is also acid damage instead of its usual type.

Effect: Slime Whip

Pathfinder Adventure: The SlitheringOGL