Well the elevator wall is so no one sees it and they think "Wow its amazing!!!" instead of "Oh, theres just a dude casting slow" Its so the dude is like behind the scenes working to make the map good, but no one will ever see him do it. Like a movie. I guess you could do thunder clap or that, it would probably be easier, but I was thinking linear with the slow. Oh, and no matter what you do, whether the slow or thunder clap, make a custom one for your dummy and change the mana cost, cooldown, and requirements to nothing.