Slaying Sway, Greater (3.5e Feat)
From D&D Wiki
Slaying Sway, Greater [Dance Style]
There is no more beautiful symphony than the dying wail of a masterfully killed victim
Prerequisite: Greater Gemini Dance, Gr. cleave, Gemini Companion, Slaying Sway (Improved)
Benefit: A Gemini Dancer with this feat grants the Gr. cleave feat to her Gemini Companion and if either score a critical hit during a round in which the target would be rended (see improved dance style), the rend damage is equal to double the base weapon damage + double your Charisma.
Normal: Any save DCs are equal to 10 + half the Gemini dancer's class level + her charisma modifier.