Whip Sneak Attack +7d6

Type of Feat: Class
Prerequisite: Lasher.
Specifics: Whenever the character makes a successful attack against an opponent who is flat-footed, cannot see them, or who is in combat with someone else, the character's blow delivers extra damage. This extra damage is +1d6 at 1st level and an additional +1d6 every four levels thereafter. This extra damage is not multiplied in the case of a critical hit.
Use: Automatic when using a whip. Monsters of the construct and undead types are immune to sneak attacks, as are any creatures that are immune to critical hits. If a lasher gets a general sneak attack bonus from another source (such as rogue levels), the bonuses to damage stack.