Sion Suggestion
I think that maybe Sion's ult could leave behind a trail similar to Galio's tornado because Sion is one of Noxus's mightiest warriors. I mean, his charge should inspire his allies to follow behind and back him up, allowing for chases and surprise initiates to occur from way in the jungle or up the lane. I think it'd be a good way to catch the enemy off guard and let Sion what his lore describes: charge into a fight and destroy his enemies while his allies rush in, inspired to finish the job.