Overwhelming Critical (light flail)

Type of Feat: Combat
Prerequisite: 21st level, Strength 23+, Cleave, Great Cleave, Improved Critical (in chosen weapon) and Power Attack.
Specifics: When using the weapon chosen, the character deals +1d6 points of damage on a successful critical hit. If the weapon's critical multiplier is x3, add +2d6, and if the multiplier is x4, add 3d6.
Use: Automatic.