Lingering Damage

Type of Feat: Epic
Prerequisite: Sneak Attack +8d6, Crippling Strike, Epic.
Specifics: Any time you deal damage with a sneak attack, that target takes damage equal to your sneak attack on your next turn as well.
Use: Automatic.
(*Note: You can select this feat even when you don't have Sneak Attack +8d6, but it will not give you any benefits, so be smart and don't choose it if you can't use it.)