Needs review
Source: Frostburn

Description: You have mastered the snowflake wardance, a mystical style of fighting with slashing weapons that allows you to leap and almost seem to float haphazardly across the battlefield like a whirling, razor-edged snowflake.

Prerequisites: Perform (6 ranks), Bardic Music

By expending one of your daily uses of bardic music, you may perform a deadly style of combat known as the snowflake wardance. Activating a snowflake wardance is a free action, and once activated, you add your Charisma modifier to your attack rolls with any slashing melee weapon you wield in one hand. This bonus to hit stacks with any bonuses you get from a high Strength score (or Dexterity score, if you are using Weapon Finesse). You cannot use this feat if you are carrying a shield, wearing medium or heavy armor, or carrying a medium or heavy load. A snowflake wardance lasts for a number of rounds equal to your ranks in Perform (dance). Performing a snowflake wardance is physically tiresome – when the snowflake wardance ends, you become fatigued for the next 10 minutes.