As it says, I'm looking for opinions on a homebrew maneuver. It hasn't been introduced in my game world, as I am interested in what people have to say.
"Spirit Strike
The martial practitioner has honed his skills to the point that he is able to strike energy entities. A character with this maneuver has learned to use his melee combat skills in a way that bypasses the Immunity to Normal Weapons of a spirit and other such creatures. In game terms, they may spend a free action to declare this technique, and they may make an attack of will, substituting a melee combat skill of their choice, with a -2 penalty, for Banishing on the Banishing +Willpower Attack of wills test. The attack of wills is resolved as normal, using Charisma as the base damage of the attack."
Thank you in advance for all opinions.
Edit: removed the requirement for learning.