This is a weapon designed to fill in the last gap in the Sealed sword lines.
The 4 star version is similar to the Faust/Avenger lines but instead of being a straight edged blade there are short spikes along one side, and instead of a purple or yellow symbol on the blade it would be a sky blue color.
The 5 star version would have much larger spikes and they would be on both sides of the blade, the symbol around the blade would be have large curved spikes on the symbol as well.
The Charge attack would be 5 spears of light they would deal less damage than the DA sword charge beams but the total DPS would be the same, the 4 star version would only shoot 3.
It could look a bit similar to this: http://img4.wikia.nocookie.net/__cb20140309023620/monsterhunter/images/1...
http://3.bp.blogspot.com/-yM6YCPJGIjw/T7pugUYdMUI/AAAAAAAAAss/AHCQFO9OYE...
Since the blade has spikes on the SIDE the standard swing style of the Sealed sword would make it so that the spikes on the side pierce.
The damage and charge time would be comparable to the Avenger lines but with pierce damage instead of elemental.
It's rather sloppy, sorry about that.
Here you go, "Five Star Version".