Gelatinous Whip

This whip was pulled from the ooze of a gelatinous cube. When motionless, the whip appears to be a sword hilt with a blob of ooze at its end. When you attack with this magic weapon, the ooze extends elastically to form the length of the whip. This whip adds 10 feet to your reach when you attack with it, instead of 5. Targets hit by this weapon are marked with an acidic residue. At the start of each of your turns, any marked target takes 1d4 acid damage, and the acidic residue disappears. While you are attuned to this weapon, its ooze is harmless to you.

Finesse: When making an attack with a finesse weapon, you use your choice of your Strength or Dexterity modifier for the attack and damage rolls. You must use the same modifier for both rolls.

Reach: This weapon adds 5 feet to your reach when you attack with it, as well as when determining your reach for opportunity attacks with it.

Proficiency: martial, whip Source: The Griffon's Saddlebag: Book Two p. 87 (Third Party)