1.It's bugged, when you cast the spell, it takes away the caster from the selection, but you can select him again...And while you have him in selection and he is slashing, you can cast the ability again and the whole thing becomes bugged.
2. Too many special effects, need to take some away, the map becomes like a colorful mess
3. It's a good spell, nice concept, but a bit overpowered.
My suggestion is you make a loop that takes unit away from selection every 0.1 seconds, or pause the unit, take away some special effects and limit it's slashing power
I do know this - xenforo dropped the ball by not keeping the vbulletin reputation comments as a feature. The loss of the Reputation comments data when we switched to Xenforo really was the death knell for the site when it came to all the users that left. I know I missed it so much and I got way less interested in the site when that feature was gone and I run the site.
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory