On behalf of every warrior everywhere: Please tell the developers that if they really believe a complete immunity to damage is balanced with a worse version of Formless Strikes, we're happy to swap abilities with samurai and call it a day.
This warrior two hour offers nothing to warriors that MS can't do with the raw physical power Mighty Strikes (and Tomahawk, as Byrth pointed out). You asked for other suggestions, we gave them. Pick one please and use it instead of your idea.