User blog comment:Darksusanoo/Kassadin...his current state and possible rework ideas/@comment-16737371-20140917202013/@comment-24674622-20140918133040

Kassadins ultimate getting changed to 20 seconds for the mana cost reset completely killed him imo. If he tries to roam, he can't even use his ultimate to get there, or it will still cost too much mana by the time he gets there. Roaming quickly is one the reasons Kassadin was strong. He can't chase as we'll either, and if you chase a little too much, and the guy's teammates get there, you are screwed because you can't afford your ult for 20 more seconds.