It is in the game, a guildmate got it the first time we completed Dragonstar on Normal mode. Had Cleave on it, and each time he used the ability it made the sword glow. Pretty cool to watch.
So, 62 more ...
This would almost bring cleave's initial damage on par with impulse.
Except it's only in front of you.
Except it's only 7 meters.
Except you sacrifice a set effect for it.
But hey, you look badass with you 2H sword (and you get some ultimates too).